6gt

[Turbwhistle]

Who here has used barnes 112gr match burners? I been running 109lrht's but they havent been coming up much, so i was thinking about trying some new bullets. I was looking at berger 115vld's, hornady 109eld-m's, or the match burners. i was also considering some berger 105's, but i like a slightly heavier bullet.

 

[CK1.0]

Who here has used barnes 112gr match burners? I been running 109lrht's but they havent been coming up much, so i was thinking about trying some new bullets. I was looking at berger 115vld's, hornady 109eld-m's, or the match burners. i was also considering some berger 105's, but i like a slightly heavier bullet.

I’ve shot ~3500 112gr Match Burners at this point and have another 3500 on the shelf…

They’re trash, total shit, you won’t hit anything with them, won’t group for shit. lol (I want to keep them in-stock and the price down)

I started using them when DTAC’s became unavailable and have been using them ever since.

I get a .301-.310 G7 for ~$0.27 a pull.

I won’t say they’re better than A-tips or 109 Hybrids… but they’re most of the way there (closer than most might think) for half the cost.

 

[Daverx7]

Who here has used barnes 112gr match burners? I been running 109lrht's but they havent been coming up much, so i was thinking about trying some new bullets. I was looking at berger 115vld's, hornady 109eld-m's, or the match burners. i was also considering some berger 105's, but i like a slightly heavier bullet.

For me, the MB 112's have been a solid alternative. Here's a target at 410 yards... I know it's not amazing but pretty good for me and my Savage Model 12.

 

[Turbwhistle]

well, i ordered 1000 of them, hopefully they shoot well while i keep an eye out for more 109's.

 

[4O6shootist]

I'm chambering 2 barrels with the long freebore alpha 6gt reamer primary for the 112 as I have quite a few. I tried them in my original short freebore 6gt chamber 2 years ago and never really could get that 1/3 moa accuracy I strive for. That barrel was a lil picky, but shot 108bt bergers in the 1s and 2s consistently.

 

[Turbwhistle]

I'm chambering 2 barrels with the long freebore alpha 6gt reamer primary for the 112 as I have quite a few. I tried them in my original short freebore 6gt chamber 2 years ago and never really could get that 1/3 moa accuracy I strive for. That barrel was a lil picky, but shot 108bt bergers in the 1s and 2s consistently.

Who is spinning up the barrels for you? My next comp barrel i want a longer freebore, and i was thinking of having a carbon 6gt barrel spun up, was thinking it would be a sweet deer rifle.

 

[4O6shootist]

Who is spinning up the barrels for you? My next comp barrel i want a longer freebore, and i was thinking of having a carbon 6gt barrel spun up, was thinking it would be a sweet deer rifle.

Manzella Precision in Montana. Excellent smith. Lead times used to be short but he's become quite busy, and for good reason. The reamer is my own purchase as his house reamer was standard gap spec. I wanted a tad more neck diameter and slightly larger diameter freebore, all which alpha offered.

 

[CK1.0]

well, i ordered 1000 of them, hopefully they shoot well while i keep an eye out for more 109's.

FWIW, they like to jump, probably more than you think (or might normally try).

I run mine ~0.100" off, and once I've decided on a load, I haven't had to touch a thing for the life of 2 barrels now. The big jump is forgiving, maybe not the tightest, but small enough groups (depending on how many you want to burn punching paper in close), but yields a boring, consistent, and reliable waterline out to 1250yrds, and one can load the same exact round the whole time.

 

[Turbwhistle]

FWIW, they like to jump, probably more than you think (or might normally try).

I run mine ~0.100" off, and once I've decided on a load, I haven't had to touch a thing for the life of 2 barrels now. The big jump is forgiving, maybe not the tightest, but small enough groups (depending on how many you want to burn punching paper in close), but yields a boring, consistent, and reliable waterline out to 1250yrds, and one can load the same exact round the whole time.

I been running a .060 jump with 109’s, so I’ll probably work up some new loads to find what these like. If the shoot well and stay available, i may just never go back. Any idea what the trued bc is on them?

 

[CK1.0]

Any idea what the trued bc is on them?

For me, right now I'm getting a .303 G7 at 2900fps on the nose, trued at 1000yrds and confirmed at 750/1250yrds.

Barnes lists a G1 of .624, I did the drag function conversion here: https://www.jbmballistics.com/cgi-bin/jbmgf-5.1.cgi

- spits out a G7 of .310 (which I've gotten on calm summer days when it's been hot as fuck out).

Starting with a .300-.310 G7 will put you in the neighborhood.

 

[Daverx7]

Any idea what the trued bc is on them?

For what it's worth, my Kestrel app has the default at:
G1 = .601
G7 = .308

Once I finish up my load development of the Berger Hybrid 109's (which has lots of fat happy seating depth to choose from), I'll definitely be going back to the MB112's and finish that effort up. It really was looking promising.

 

[Daverx7]

I been running a .060 jump with 109’s, so I’ll probably work up some new loads to find what these like. If the shoot well and stay available, i may just never go back. Any idea what the trued bc is on them?

Did a little bit of digging and found one of my logs...

This one is a velocity test with my Savage Model 10... Jump was 20K. I know this is a small range of charge weight, but did 3 rounds to see if they were going to give an indication of consistency.

Note... My Model 10's barrel shoots faster than my 12.

Maybe it is of some use?

 

[Jefe's Dope]

50 fps increase in speed normal at 800 rounds through a barrel? This is what I recorded yesterday on the MS. DOPE was consistent out to 1010 with this input.

 

[4O6shootist]

50 fps increase in speed normal at 800 rounds through a barrel? This is what I recorded yesterday on the MS. DOPE was consistent out to 1010 with this input.

Not really......I've had my hawkhill and bartleins stabilize by 200. Then one oddball had a jump again at 400. Check for carbon ring? Powder or bullet lot change?

 

[CK1.0]

50 fps increase in speed normal at 800 rounds through a barrel? This is what I recorded yesterday on the MS. DOPE was consistent out to 1010 with this input.

50fps would have me looking at the enviormentals and reconfirming my zero first… then, if the weather/elevation was close enough to not be the culprit, and the zero was solid, I’d look elsewhere. It could be a number of things… like: if you don’t anneal every firing your neck tension could be changing, etc.

I’d clean the barrel, recheck zero, and see what you get, you may have been off before and now you’re right lol.

 

[Jefe's Dope]

number of things… like: if you don’t anneal every firing your neck tension could be changing, etc.

Winner, winner, chicken dinner.

This is the first time I haven’t annealed.

All components are the same. I cleaned the carbon ring not long ago. Zero was spot on. Like a .5 moa group of ten rounds during chrono/zero. Waterline at 1000 was spot on for chrono’d speed and very consistent. Except for the stages I dropped, I cleaned or nearly cleaned those I could actually shoot. I need to figure out how to be more consistent.

 

[CK1.0]

Winner, winner, chicken dinner.

This is the first time I haven’t annealed.

All components are the same. I cleaned the carbon ring not long ago. Zero was spot on. Like a .5 moa group of ten rounds during chrono/zero. Waterline at 1000 was spot on for chrono’d speed and very consistent. Except for the stages I dropped, I cleaned or nearly cleaned those I could actually shoot. I need to figure out how to be more consistent.

I think the problem with this stuff is once you get it sort of figured out, you’re kind of screwed, because then it means you end up doing every single step, every single time lol.

 

[4O6shootist]

Winner, winner, chicken dinner.

This is the first time I haven’t annealed.

All components are the same. I cleaned the carbon ring not long ago. Zero was spot on. Like a .5 moa group of ten rounds during chrono/zero. Waterline at 1000 was spot on for chrono’d speed and very consistent. Except for the stages I dropped, I cleaned or nearly cleaned those I could actually shoot. I need to figure out how to be more consistent.

Skipping annealing one time changing 50fps? Possibly? I've tried 002 to 006 neck tension before and there was maybe 15fps in between everything. Not annealing will likely change you're spring back and probably give 001 less neck tension, which would maybe give you 10fps more velocity. This is just in my experience/testing. I just asked a guys who I know anneal every 3 firings, they do not see more than 20fps increase in velocity in between any of their reload cycles without annealing. Do you have a bore scope? Whats your load data/cartridge? Some powders foul quicker than others, do you have a tight freebore diameter that'd show carbon ring pressure sooner? I had a tight bore 6mm Krieger near 800 rounds it started shooting fast like WAY fast 100fps and major psi signs. I cleaned the dog shit out that barrel as RL16 was leaving carbon ring in the chamber neck, freebore and leade, as well as first 4" of barrel. I never did get it back to where it was, I ended up having to drop a node as the high node now had pressure. This was due to the 236 vs 237 bore diameter, and at 800 rounds the barrel started to get enough fire cracking in throat to cause bullets to pressure up.

 

[Daverx7]

Since the weather wasn't working out for finishing up my Hybrid 109 development, I thought I would just have some fun and shoot a MB 112 load with my Model 12, and a RDF 115 with the Model 10. I was able to get one good group in before the wind picked up and lots of mirage.

 

[4O6shootist]

Since the weather wasn't working out for finishing up my Hybrid 109 development, I thought I would just have some fun and shoot a MB 112 load with my Model 12, and a RDF 115 with the Model 10. I was able to get one good group in before the wind picked up and lots of mirage.

View attachment 7963530

2900-2930fps area?

 

[Daverx7]

MB 112....
Velocity, SD, ES
2933, 4, 11
2935, 5.1, 18

 

[4O6shootist]

MB 112....
Velocity, SD, ES
2933, 4, 11
2935, 5.1, 18

Nice, I'm building a 6gt for the woman, 26" marksman 7.5tw on an origin. 170 freebore, will be running these 112s. Either N150, H4350, RL16 or N555, whichever gives best performance at that 2900 node.

 

[Daverx7]

Nice, I'm building a 6gt for the woman, 26" marksman 7.5tw on an origin. 170 freebore, will be running these 112s.

I've had pretty good luck with the two of mine (Criterion 26" SS MTU for the Savages).

The only bullet that seems to have me scratching my head is the Blem RDF 115's (I even sorted them by OAL). The rest have been solid:

ELDM 108​

SMK 107​

MB 112​

Berger Hybrid 109's have by far been the best ones​

I do have a few others that are waiting in queue to be tried (ELDM 109, Berger Hybrid 105, MB 105, etc.)

Hope you the one you build for her becomes a good shooter!

 

[S3th]

Anyone having to use a modified BR spacer kit for their 6GT to feed flawlessly?

 

[4O6shootist]

Anyone having to use a modified BR spacer kit for their 6GT to feed flawlessly?

I have had zero issues feeding gt from MDT, accurate, or arc aics mags. I know in the ai rifles, guys will modify hrd aw mag kits as the gt needs more oal than the dasher.

 

[CK1.0]

Just a PSA for anyone who goes with the Hornady 6mmGT custom die set that GA Precision sells here: https://www.gaprecision.net/ga-store/reloading/hornady-6mm-gt-die-set-w-microjust-seater.html

If you want to use the included FL die without the expander ball, but still want to decap/deprime while sizing, you'll need this:

Hornady part no. 396303 "New Dimension Die Decapping Pin Retainer Pistol" - https://www.midwayusa.com/product/1011064613?pid=480942

- and FWIW, as it comes out of the box, be advised that I think they use Loctite on the expander ball spindle assembly (I had to use a torch to disassemble mine).

JMHO, but I think the die set is a great deal because you get a custom-honed FL die (.266) without the hassle of sending in fired cases and then having to wait... But, if you don't use expander balls, and instead use a mandrel to open up the necks after sizing (like all the cool kids), you'll either need to decap first in a separate step, or, order the little part mentioned above.

 

[Hickswr]

Just a PSA for anyone who goes with the Hornady 6mmGT custom die set that GA Precision sells here: https://www.gaprecision.net/ga-store/reloading/hornady-6mm-gt-die-set-w-microjust-seater.html

If you want to use the included FL die without the expander ball, but still want to decap/deprime while sizing, you'll need this:

Hornady part no. 396303 "New Dimension Die Decapping Pin Retainer Pistol" - https://www.midwayusa.com/product/1011064613?pid=480942

- and FWIW, as it comes out of the box, be advised that I think they use Loctite on the expander ball spindle assembly (I had to use a torch to disassemble mine).

JMHO, but I think the die set is a great deal because you get a custom-honed FL die (.266) without the hassle of sending in fired cases and then having to wait... But, if you don't use expander balls, and instead use a mandrel to open up the necks after sizing (like all the cool kids), you'll either need to decap first in a separate step, or, order the little part mentioned above.

Good tip!

OR…..skip the torch required disassembly step and just take a few thousands off the expander ball with a Dremel and then use it to decap and straighten out really damaged necks while still retaining the ability to set final neck diameter with a mandrel.

 

[tthomp302]

Looking forward to messing around with this caliber. Building a rifle for my fiance to shoot recreationally long range as well as hunt with. Does anyone have any experience hunting with the gt yet? I'm planning on running the 105 hybrids with varget.

737 NBK
Manners LRH
24" Bartlein M24 pre-fit from Bugholes with spiral fluting.

Going to be running it suppressed a majority of the time with my OCL hydrogen.

 

[ECK]

Finally got to shoot my 6GT build. Impact Precision action, Proof competition contour barrel blank, and MDT ACC chassis. I had a local competitor/gunsmith/machinist spin up the barrel and ended up with 27” barrel.

Shot the first 40 rnds today, first 10 or so were break-in/zero. The next 30 were getting acquainted at various distances from 100 to 550 yds. I had a magneto speed on it for the first 20 rnds. All 40 rnds were Hornady factory 109 gr ELD-M’s.

Max velocity: 2,944
Min velocity: 2,916
Average velocity: 2,928
SD: 11.2 (not bad for factory ammo I suppose)

My plan going forward is finish shooting the rest of the Hornady factory ammo I bought for break-in and the getting-to-know-you phase, then start working up a load. I’ve got a wad of H4350 powder, CCI SR primers, my once fired brass (see how long the Hornady brass lasts…), and a supply of 108 gr ELD-Ms.

I purchased the Hornady dies that GAP sells, but also bought a Mighty Armory decapping die and 21st Century mandrel die. Thinking I’ll decap, tumble, FL size (with the expander ball removed), then size the neck with the mandrel die. Chamfer/debur, clean the primer pockets, then prime.

See anything I should be thinking about?

FWIW, I’ve loaded a barrel’s worth of 6.5CM and also for various hunting calibers over the year. With the 6.5CM, I’ve been mainly neck sizing with a Forster bump die and bushing. The 6GT is the first rifle caliber I’m going to try breaking the brass prep down into decap/FL size/mandrel size the neck.

 

[Professor Oblivion]

Finally got to shoot my 6GT build. Impact Precision action, Proof competition contour barrel blank, and MDT ACC chassis. I had a local competitor/gunsmith/machinist spin up the barrel and ended up with 27” barrel.

Shot the first 40 rnds today, first 10 or so were break-in/zero. The next 30 were getting acquainted at various distances from 100 to 550 yds. I had a magneto speed on it for the first 20 rnds. All 40 rnds were Hornady factory 109 gr ELD-M’s.

Max velocity: 2,944
Min velocity: 2,916
Average velocity: 2,928
SD: 11.2 (not bad for factory ammo I suppose)

My plan going forward is finish shooting the rest of the Hornady factory ammo I bought for break-in and the getting-to-know-you phase, then start working up a load. I’ve got a wad of H4350 powder, CCI SR primers, my once fired brass (see how long the Hornady brass lasts…), and a supply of 108 gr ELD-Ms.

I purchased the Hornady dies that GAP sells, but also bought a Mighty Armory decapping die and 21st Century mandrel die. Thinking I’ll decap, tumble, FL size (with the expander ball removed), then size the neck with the mandrel die. Chamfer/debur, clean the primer pockets, then prime.

See anything I should be thinking about?

FWIW, I’ve loaded a barrel’s worth of 6.5CM and also for various hunting calibers over the year. With the 6.5CM, I’ve been mainly neck sizing with a Forster bump die and bushing. The 6GT is the first rifle caliber I’m going to try breaking the brass prep down into decap/FL size/mandrel size the neck.

Nice rig! I like the magnifier (what brand?) and the wrap on that Burris. I'm looking at that same scope, what height are the rings?

You should be just fine with H4350 and the 108 ELD-Ms, especially since it shoots the factory ammo so well. And your process sounds spot on.

I am up to 6 firings of Hornady brass with no issues. Mostly 33.5 of Varget behind 105 grainers (~2950 fps), but also 36.5 of RL-16 behind 112 MBs (~2900 fps). I anneal every 3-4 firings.

Keep us posted!

 

[ECK]

Nice rig! I like the magnifier (what brand?) and the wrap on that Burris. I'm looking at that same scope, what height are the rings?

You should be just fine with H4350 and the 108 ELD-Ms, especially since it shoots the factory ammo so well. And your process sounds spot on.

I am up to 6 firings of Hornady brass with no issues. Mostly 33.5 of Varget behind 105 grainers (~2950 fps), but also 36.5 of RL-16 behind 112 MBs (~2900 fps). I anneal every 3-4 firings.

Keep us posted!

Thanks! This is my first custom build, coming off of a fairly stock RPR. I shot some barricade drills yesterday and was pleasantly surprised at how well this new gun balances and the added weight reduces the wobble zone without having to use a tripod for rear support.

MK Machining makes the turret magnifier -tho to be honest the numbers on the Burris are pretty decent size compared to my older scope. The wrap is KT tape from Amazon. Rings are 1” Burris XTR Signature rings (34mm). Same scope and setup on my rimfire rifle, and I really like the SCR2 reticle -enough info to be useful but not too much for it to be cluttered.

Confession time, one of the reasons I went with 6GT was bc I had a bunch of H4350. For a while I was contemplating 6BR but would have had to go on the hunt for powders I don’t have (i.e. Varget).

When I was loading 6.5CM I was annealing each time so figured I’d do the same with the GT. I’m retired, so time is not a factor…

 

[SouthFLShootin]

Who is spinning up the barrels for you? My next comp barrel i want a longer freebore, and i was thinking of having a carbon 6gt barrel spun up, was thinking it would be a sweet deer rifle.

Great mimds think alike...I just put this together the other day. Unfortunately, I'm still waiting on the MDT HNT chassis/stock and some lower height rings I ordered. I threw it in my PRS chassis today so I could break in the barrel and satisfy an itch that had to be scratched.

Im using a 22" proof carbon barrel. I was shooting some of my left over 109 berger loads from PRS rig and it shoots 1/2 MOA with those straight out the gate. Velocity was around 2740fps, compared 2860 out of my broken in 6GT PRS gun with 27" barrel. It didnt like the 112MB load from the same gun.

Tried some 95gr Barnes LRX solids I intend to hunt with and loaded them with 6.5 Staball. Those were around 3130FPS before showing signs of pressure. They also were about 1/2 MOA.

Thinking with alpha brass and a broken in barrel I should be able to get close to 3200 FPS with that 95gr solid. Should work fine on anything I will ever see around here. I will say, at 22", the 6gt has some bark with a muzzle brake.

First ten rounds on the barrel.

Typical group , no load development yet.

 

[Vandoogle13]

Anyone running RCBS matchmaster dies and notice a wide donut after resizing?
I've adjusted my bushing as far down as possible.
Rifle shoots great, im only curious if others are experiencing this?

 

[SouthFLShootin]

Anyone running RCBS matchmaster dies and notice a wide donut after resizing?
I've adjusted my bushing as far down as possible.
Rifle shoots great, im only curious if others are experiencing this?
View attachment 7972647View attachment 7972645

Is your die bottoming out on the case holder of the press or do you have some space between the two?

 

[Vandoogle13]

Is your die bottoming out on the case holder of the press or do you have some space between the two?

I am camming out the press and achieving 002-.003 shoulder bump.

 

[4O6shootist]

Anyone running RCBS matchmaster dies and notice a wide donut after resizing?
I've adjusted my bushing as far down as possible.
Rifle shoots great, im only curious if others are experiencing this?
View attachment 7972647View attachment 7972645

I used that particular die, no issues whatsoever. 267 bushing, no expander, no mandrel. I never found donut, not marks on neck like that. Clearly what's causing that to happen is bushing related. You screwed the bushing stem all the way down till bottomed out against the bushing, then reversed 1/8th a turn before locking? I've since switched to a bullet central micron die, piece of art.

 

[Vandoogle13]

I used that particular die, no issues whatsoever. 267 bushing, no expander, no mandrel. I never found donut, not marks on neck like that. Clearly what's causing that to happen is bushing related. You screwed the bushing stem all the way down till bottomed out against the bushing, then reversed 1/8th a turn before locking? I've since switched to a bullet central micron die, piece of art.

You are spot on! I needed to adjust the bushing stem further down, stupid mistake on my part!
Thanks for the help fellas!

 

[4O6shootist]

You are spot on! I needed to adjust the bushing stem further down, stupid mistake on my part!
Thanks for the help fellas!

Glad to help. Bushing dies take a lil more tuning than standard full length dies.

 

[Juggerxxx]

Anyone running RCBS matchmaster dies and notice a wide donut after resizing?
I've adjusted my bushing as far down as possible.
Rifle shoots great, im only curious if others are experiencing this?
View attachment 7972647View attachment 7972645

Yes and I have the bushing adjustment screwed all the way down except a 1/16 of a turn. I also cam over and I also start to see this on SAC dies after 10 firings.

 

[xdeano]

Anyone here using 6GT with lighter bullets in the 95gr range?

I just picked up some 6.5 StaBall to try in a 6GT I'm building for being a handy/hunting rifle. I plan on shooting the Barnes 95gr LRX solids in it out of a proof 22" carbon barrel.

According to the data on Hogdon's website, I should be able to get around 3200 FPS. (Assuming normal loss in speed from the 24" test barrel used for their data) This seems a bit high out of a 22" barrel IMO, but with alpha brass and a gun that won't be shot much, I'm going to run it as hard as I can.

I know, I'm better going with a 6CM or 6.5CM for hunting, but I really like the GT and if I can push a 95gr 3200FPS, it will take care of everything I need it to. It will also most likely shoot my match ammo from my other guns pretty well too, which means one less thing to load for.

South FL,
I have ran some of the 88grn Hammer Hunters in a 7 twist 22" Osprey barrel with staBall6.5. They were running pretty hot. But man did they do awesome on deer. The doe my son shot for youth season was shot at 96yds full broadside, it hit, made soup out of the chest cavity and exited on the offside with a hole the size of my thumb and two other holes a couple inches apart I could stick my index finger through. Essentially looked like a bowling ball configuration.

What I did was use the manuals 95grn load and worked up because no one is publishing data for the 88s. You can go above max on the 95s to get the 88s to a decent velocity.

Hope this helps.
Xdeano

 

[SouthFLShootin]

South FL,
I have ran some of the 88grn Hammer Hunters in a 7 twist 22" Osprey barrel with staBall6.5. They were running pretty hot. But man did they do awesome on deer. The doe my son shot for youth season was shot at 96yds full broadside, it hit, made soup out of the chest cavity and exited on the offside with a hole the size of my thumb and two other holes a couple inches apart I could stick my index finger through. Essentially looked like a bowling ball configuration.

What I did was use the manuals 95grn load and worked up because no one is publishing data for the 88s. You can go above max on the 95s to get the 88s to a decent velocity.

Hope this helps.
Xdeano

Thanks for the info.

I got a bunch of 95gr Barnes LRX bullets, but they just don't shoot consistent enough for me. I was using staball and pressured out around 3140 in a 22" barrel.

I had some 108gr EOL berger rounds I loaded up awhile ago and decided to just try that load and see how it shoots. It shoots REALLY well. 37gr of RL16, 108gr EOL Berger, 2860fps in a 22" barrel.

I really wanted to get a monolithic bullet to work well in this setup, but it's hard to walk away from that load with such a high BC hunting bullet. Plus I can get a bunch of them.

I may get some of the Hammer Hunters to try as well. It would be nice to have two options that shoot well in this caliber.

 

[4O6shootist]

Thanks for the info.

I got a bunch of 95gr Barnes LRX bullets, but they just don't shoot consistent enough for me. I was using staball and pressured out around 3140 in a 22" barrel.

I had some 108gr EOL berger rounds I loaded up awhile ago and decided to just try that load and see how it shoots. It shoots REALLY well. 37gr of RL16, 108gr EOL Berger, 2860fps in a 22" barrel.
View attachment 7974979

I really wanted to get a monolithic bullet to work well in this setup, but it's hard to walk away from that load with such a high BC hunting bullet. Plus I can get a bunch of them.

I may get some of the Hammer Hunters to try as well. It would be nice to have two options that shoot well in this caliber.

Check out badlands precision aluminum tipped solids. The bulldozer is their hunting line.

 

[ECK]

My new GT barrel has 160 rnds of factory ammo thru it and my velocities seemed to have stabilized as of the last 20 rnds fired. So this morning I shot two 10-shot strings (Satterlee’s method) and got the following velocities (Magneto Speed V3) with a starting load of 34.6 gr and ending at 36.4 gr of H4350 w/ Hornady 108 ELDMs. Seated the bullets to the same CBTO as Hornady 109 gr ELDM factory ammo, which if I measured right is a .035” jump.

I cleaned my barrel right after the last session and forgot to bring any extra rounds with me to foul the barrel prior to starting the test. So string 1 was shot thru a clean barrel (which I suppose explains the jump in velocity between shots 1 and 2). That being the case I’m looking more at the two potential nodes in string 2 (circled below).

Debating if I should load up a 3rd string and do another test as a comparison -or- just commit to one of the nodes in String 2. Thinking I’d go with the lower node to start with if I did that, and also load some at .050” and .070” jump.

Intended purpose of these rounds is PRS and LR Varmint matches.

Thoughts?

 

[SouthFLShootin]

My new GT barrel has 160 rnds of factory ammo thru it and my velocities seemed to have stabilized as of the last 20 rnds fired. So this morning I shot two 10-shot strings (Satterlee’s method) and got the following velocities (Magneto Speed V3) with a starting load of 34.6 gr and ending at 36.4 gr of H4350 w/ Hornady 108 ELDMs. Seated the bullets to the same CBTO as Hornady 109 gr ELDM factory ammo, which if I measured right is a .035” jump.

I cleaned my barrel right after the last session and forgot to bring any extra rounds with me to foul the barrel prior to starting the test. So string 1 was shot thru a clean barrel (which I suppose explains the jump in velocity between shots 1 and 2). That being the case I’m looking more at the two potential nodes in string 2 (circled below).

Debating if I should load up a 3rd string and do another test as a comparison -or- just commit to one of the nodes in String 2. Thinking I’d go with the lower node to start with if I did that, and also load some at .050” and .070” jump.

Intended purpose of these rounds is PRS and LR Varmint matches.

Thoughts?

View attachment 7975263

I have had gone through 4 barrels now, and every single one them was most stable between 2860-2890 with 109 Bergers. H4350 and just over 36 grains of powder. (26" barrels)

That node is a great node for barrel life, a little less snappy recoil and your brass will last longer as well. You could run the lower speed node, but IMO, you may as well shoot a BR. There's no real benefit to shooting the lower node with the 6GT.

I have almost stopped doing load development for my PRS guns. Usually one of the loads from my previous barrels gets me really close, and I fine tune from there. I'd rather use the first 100 or so rounds to practice positional with an old load, and then worry about refining the load if I even have to once I know the barrel is done breaking in.

 

[ECK]

I think I found my load! Picked one of my nodes from the 10-shot test the day before (went with the lower one as I was thinking my barrel might pick up some speed as I hit 200 rnds, and it did -that group chrono’d at 2,843 fps) and loaded up various seating depths with jumps from .030”, .050”, to .070”. Group with .070” is pictured below.

FWIW, I self-admittedly suck at shooting groups. Might have the first three touching then I always shank #4 or #5. But not this time. Had one other one hole group out of that batch, so gonna give props to the rifle/chassis and the guy who spun up the barrel.

Now to load up 100 rnds and hit the range and get dope out as far as the range offers (900-1,000 ish).

 

[xdeano]

Check out badlands precision aluminum tipped solids. The bulldozer is their hunting line.

They have a good bullet too. Just wished the offered a 90grn bullet. They have an 80 and 100grn. I just barely meet the twist for the 100grn with a 7 twist. I might have to try them at some point.

Deano

 

[xdeano]

Whats everyone running for primers now a days? I have been running remington 7 1/2 mag primers but I'm running. A bit low. I see guys are running the 450. Are guys having better luck with a standard Small Rifle primer or a Mag. I know in some of my magnum cartridges I get better es/SD with a standard. I'm running either varget or staball6.5. Thanks guys!
Deano

 

[4O6shootist]

Whats everyone running for primers now a days? I have been running remington 7 1/2 mag primers but I'm running. A bit low. I see guys are running the 450. Are guys having better luck with a standard Small Rifle primer or a Mag. I know in some of my magnum cartridges I get better es/SD with a standard. I'm running either varget or staball6.5. Thanks guys!
Deano

Staball, being a ball powder, id recommended 450s. Varget will give consistent ignition with standard or magnum. I run cci450 in all my srp cases: br, bra, gt & creeds. Only problem I've had is 450s getting 100% reliable ignition in my 22 creed with rl26 in freezing temps, have observed a few hang fires.

 

[xdeano]

Staball, being a ball powder, id recommended 450s. Varget will give consistent ignition with standard or magnum. I run cci450 in all my srp cases: br, bra, gt & creeds. Only problem I've had is 450s getting 100% reliable ignition in my 22 creed with rl26 in freezing temps, have observed a few hang fires.

Good to know! Thank you sir!

 

[Bolt Thrower]

26" Bartlein M24, 1:7.5" twist @ 490 rounds:
Berger 105 gr Hybrid
CCI 450
Alpha OCD Brass (1x fired)
+/-0.040" jump
36.7 gr H4350
Ave MV: 2,952
ES: 17
SD: 5.5
Groups 0.3" to 0.5" @ 100 yards

So far this is the most consistent load I've found for this barrel or my previous barrel.