6gt

Just got a 20 inch 6GT barrel in from Altus, very impressed with how it works. Had a few loaded rounds left for my 26 inch match barrel so I shot those through it. 65 rounds total today hammered all day long. MV 2752 SD 7.5 The same load in my 26 inch barrel does MV2890 SD3.1. They did the badger EFR in the stock as well. Great stuff, very happy with how this thing is coming together!
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Haven't gotten into my 2nd GT barrel, yet, so I haven't seen it there, but definitely seen it with other cartridges - especially when swapping barrels. Basically, the very bottom of the case isn't getting sized down and eventually expands just a bit.

The fix for .308 case head size cases is actually surprisingly easy (at least, it has been for me, in the past). Get a Lee .45 ACP U-die (undersize sizing die), take the decapping stem out of it, and run your cases through it. It's a carbide die for a straight wall pistol case, so it's just a sizing ring - won't bump your shoulders or anything like that (which is something that *will* happen with cartridges that have a small base die - to full size the base, you end up squishing your shoulders back a lot, too). Then do a normal sizing die pass.
OMG I'm so glad I found this!! Thank you for posting this solution. I'm getting ready to go from barrel #2 to barrel #3 and I COULD NOT get my brass to freely chamber in #3. Thought I was going to have to scrap almost 400 pieces of 4x fired Alpha.


Interestingly- Hornady, Widden, and Forster 6GT dies wouldn't size far enough down the base but my buddy's RCBS Matchmaster would.

Also running the brass through the Lee 45acp undersized die works for me as well.
 
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Just got a 20 inch 6GT barrel in from Altus, very impressed with how it works. Had a few loaded rounds left for my 26 inch match barrel so I shot those through it. 65 rounds total today hammered all day long. MV 2752 SD 7.5 The same load in my 26 inch barrel does MV2890 SD3.1. They did the badger EFR in the stock as well. Great stuff, very happy with how this thing is coming together!
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looks good got lapua brass on back order & ordering a barrel fro krieger already got rifle just going to switch barrels
 
Also running the brass through the Lee 45acp


Interestingly- Hornady, Widden, and Forster 6GT dies wouldn't size far enough down the base but my buddy's RCBS Matchmaster would.

Redding dies, too, for calibers they make. I ran into it initially with 6.5 Creed. No one made a small base die for it - was trying to figure out other options - but didn’t want to set my shoulders way back, either.

I forget where I came across the .45 ACP die trick - here or accurateshooter.com, most likely, works like a champ!

Glad it helped!
 
OMG I'm so glad I found this!! Thank you for posting this solution. I'm getting ready to go from barrel #2 to barrel #3 and I COULD NOT get my brass to freely chamber in #3. Thought I was going to have to scrap almost 400 pieces of 4x fired Alpha.


Interestingly- Hornady, Widden, and Forster 6GT dies wouldn't size far enough down the base but my buddy's RCBS Matchmaster would.

Also running the brass through the Lee 45acp undersized die works for me as well.
Or just buy a RCBS matchmaster fl bushing die. It sizes tight as hell. My original 700x pcs 6gt ocd from 4 years ago, has idk, 8-10 firings on it. Several barrels now. I don't run hot, 2850-2950 with 109-115gr bullets in 28" barrels with H4350. They still come out the die @ 470-47025 using my micrometer. Never had a clicker cept when I sized one rotation with a BC Micron die that I bought on here. The RCBS sized the web down almost 001 smaller than the spendy BC die. Sold it very shortly after, ran all that brass through the RCBS, clickers gone.......
 
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Or just buy a RCBS matchmaster fl bushing die. It sizes tight as hell. My original 700x pcs 6gt ocd from 4 years ago, has idk, 8-10 firings on it. Several barrels now. I don't run hot, 2850-2950 with 109-115gr bullets in 28" barrels with H4350. They still come out the die @ 470-47025 using my micrometer. Never had a clicker cept when I sized one rotation with a BC Micron die that I bought on here. The RCBS sized the web down almost 001 smaller than the spendy BC die. Sold it very shortly after, ran all that brass through the RCBS, clickers gone.......
For sure I would have resized everything with a RCBS Matchmaster before tossing the brass.
 
Or just buy a RCBS matchmaster fl bushing die. It sizes tight as hell. My original 700x pcs 6gt ocd from 4 years ago, has idk, 8-10 firings on it. Several barrels now. I don't run hot, 2850-2950 with 109-115gr bullets in 28" barrels with H4350. They still come out the die @ 470-47025 using my micrometer. Never had a clicker cept when I sized one rotation with a BC Micron die that I bought on here. The RCBS sized the web down almost 001 smaller than the spendy BC die. Sold it very shortly after, ran all that brass through the RCBS, clickers gone.......
Good to know as that's exactly what I've ordered. How many rounds are your barrels lasting? I'm looking at running the same bullets/speed/barrel length as you.
 
Good to know as that's exactly what I've ordered. How many rounds are your barrels lasting? I'm looking at running the same bullets/speed/barrel length as you.
I pull em at 2500. Running a cool powder is important. H4350 VS varget or rl16 makes a difference. My first I ran rl16 at 2950mv, 1800 rounds and fire cracking was so bad it'd tear up jackets and down range performance suffered. Still shot pretty well inside 400y. But the BC was all over from bullet damage. It coppered like a mofo too. My hawkhill barrels have been great. Glad I still have 6 more blanks on the shelf.
 
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I pull em at 2500. Running a cool powder is important. H4350 VS varget or rl16 makes a difference. My first I ran rl16 at 2950mv, 1800 rounds and fire cracking was so bad it'd tear up jackets and down range performance suffered. Still shot pretty well inside 400y. But the BC was all over from bullet damage. It coppered like a mofo too. My hawkhill barrels have been great. Glad I still have 6 more blanks on the shelf.
Yes, the challenge is going to be finding something equivalent to H4350 as we can't get that anymore here. N150 might be close.
 
N150 burns at a fair faster rate in my experience in the gt. My ladies first barrel was around 32.8gr with N150 to run a 107smk at 2950, the equivalent charge of H4350 was 36.1gr. I've never tried N160 in the GT. Fellas do use N555, and it's very much unlike the rest the N5XX series powders in that it's cool burning, although slower than H4350 by a bit, you'd likely need to run 37-37.5gr. But it'd be a nice full case!


Yes, the challenge is going to be finding something equivalent to H4350 as we can't get that anymore here. N150 might be close.
 
You guys are really over thinking the BC and velocity aspect.

There’s a reason why the guys winning PRS matches are running 105 Hybrids sub 2900 fps and a lot sub 2850.

Sure the DTACs beat the 105s on paper and cost every time but it never seems to work out that way in competition.
 
Loaded some incremental charges of SW Precision pushing 105gr MB last week.


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Went to the range yesterday....finally had a chance to shoot the new 6GT rifle.


No pressure signs whatsoever.

Will load some more at 33.8gr for next session.

Also took a 6.5CM to shoot.

Brass was deprimed & cleaned when I got home.

Zero feeding problems whatsoever with the 6GT in AIAW mags. Gotta love the irony of a magazine labelled "arctic warfare" running like a champ in hot as balls, humid has hell conditions. :giggle: The gun ran great.

The 6.5CM fed like shit. Could hardly get through a single friggin magazine without trouble.


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You guys are really over thinking the BC and velocity aspect.

There’s a reason why the guys winning PRS matches are running 105 Hybrids sub 2900 fps and a lot sub 2850.

Sure the DTACs beat the 105s on paper and cost every time but it never seems to work out that way in competition.
You have another 3-4gr powder cap over the br variants that you're speaking of. So why not run a dtac or 112mb at the same velocity those guys are running 105s? Been running the 115s 2820/2880 in 26-30" tubes with 35.6-36.0 H4350. It works very well. My favorite is my 65cm with 153.5 Bergers at 2620-2630fps.
 
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You guys are really over thinking the BC and velocity aspect.

There’s a reason why the guys winning PRS matches are running 105 Hybrids sub 2900 fps and a lot sub 2850.

Sure the DTACs beat the 105s on paper and cost every time but it never seems to work out that way in competition.
I recognize Litz's point about BC consistency with the 105 hybrids.

But I'm over here like these shooters also win for reasons other than just bullet choice though. Like you give those shooters dtacs and it'll work out.
 
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I recognize Litz's point about BC consistency with the 105 hybrids.

But I'm over here like these shooters also win for reasons other than just bullet choice though. Like you give those shooters dtacs and it'll work out.
I mean, those guys shooting a 105s in a dasher at 2850 could run 110 atips at 2730 and have same wind holds. All these rifles do the same thing, some have more recoil, more energy on target, some less. There's so many ways a guy can play this game.
 
You have another 3-4gr powder cap over the br variants that you're speaking of. So why not run a dtac or 112mb at the same velocity those guys are running 105s? Been running the 115s 2820/2880 in 26-30" tubes with 35.6-36.0 H4350. It works very well. My favorite is my 65cm with 153.5 Bergers at 2620-2630fps.
Again it sounds good in theory, but when you shoot the matchburners at distance (on paper) against the bergers, you’ll understand why the berger is the better option. At least that was my experience with the 112MB and 110SMK.

I’ve never fired a DTAC but would like to play with some just to satisfy my curiosity. However I suspect I already know the answer or else the folks on the podium would be using them.
 
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N150 burns at a fair faster rate in my experience in the gt. My ladies first barrel was around 32.8gr with N150 to run a 107smk at 2950, the equivalent charge of H4350 was 36.1gr. I've never tried N160 in the GT. Fellas do use N555, and it's very much unlike the rest the N5XX series powders in that it's cool burning, although slower than H4350 by a bit, you'd likely need to run 37-37.5gr. But it'd be a nice full case!
I am keeping my eyes open for some N555 too but everything is sold out here at the moment. I'm aiming for midrange F-Class targets so I don't have some of the same issues the PRS guys have with recoil or splash. I want reduced wind drift most of all to keep me competitive with with the 6BR and 6.5CM people I shoot with 😉
 
Again it sounds good in theory, but when you shoot the matchburners at distance (on paper) against the bergers, you’ll understand why the berger is the better option. At least that was my experience with the 112MB and 110SMK.

I’ve never fired a DTAC but would like to play with some just to satisfy my curiosity. However I suspect I already know the answer or else the folks on the podium would be using them.
Are you saying specifically compared against Berger 105gr Hybrids or Berger in general? Like for example, what about the Berger 115gr VLDs or the new Berger 109gr Hybrids?
 
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Are you saying specifically compared against Berger 105gr Hybrids or Berger in general? Like for example, what about the Berger 115gr VLDs or the new Berger 109gr Hybrids?
I’ve only used 105 & 109 Hybrids. I’ve read the VLDS are seating depth sensitive and I know the hybrids are not. Throat will erode 0.010 over the course of a 2-day match and tuneup, so I have no desire to shoot a bullet that is finicky about seating depth.
 
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Again it sounds good in theory, but when you shoot the matchburners at distance (on paper) against the bergers, you’ll understand why the berger is the better option. At least that was my experience with the 112MB and 110SMK.

I’ve never fired a DTAC but would like to play with some just to satisfy my curiosity. However I suspect I already know the answer or else the folks on the podium would be using them.

There have been a lot of matches one with DTACs, and when guys win it has a lot more to do with the Indian than the arrow.

Realistically, if a guy was cheap and had a comparator and a good enough scale, he could beat Berger or anybody else's standards just by sorting.

Generally speaking, a $.60 bullet is going to be more consistent than a $.30 bullet (for the cost difference, it should be at least). But, guys are kidding themselves if they think a bullet that costs twice as much always means it's twice as good. The differences between a random box of Match Burners and/or boring Hornady HPBT's and a box of Hybrid Target's or A-Tips isn't as vast as some might think. I know more than a couple of guys who will never even make it into the mid-pack (let alone out of it) who only shoot Bergers and/or A-Tips lol.
 
There have been a lot of matches one with DTACs, and when guys win it has a lot more to do with the Indian than the arrow.

Realistically, if a guy was cheap and had a comparator and a good enough scale, he could beat Berger or anybody else's standards just by sorting.

Generally speaking, a $.60 bullet is going to be more consistent than a $.30 bullet (for the cost difference, it should be at least). But, guys are kidding themselves if they think a bullet that costs twice as much always means it's twice as good. The differences between a random box of Match Burners and/or boring Hornady HPBT's and a box of Hybrid Target's or A-Tips isn't as vast as some might think. I know more than a couple of guys who will never even make it into the mid-pack who only shoot Bergers and/or A-Tips lol.
I can agree with this 100%. Even a 5% bc es spread isn't going to be noticeable on a target. Take a 112 MB for example, I've used them with a 308g7 to 1200y. Anyways, run a ballistics chart at 301g7, and another at 315g7. Difference is not even a tenth/elevation till you get to 1k yards. Now the 112s I had from 4-5 years ago, were junk. Huge bto variation, weights were all over, and the pressure rings were of different diameters. I only use those to season a new barrels first 100-150 rounds. However the last 2500 I bought this spring, have been very consistent. Sierra 107s are as consistent dimensionally as any Berger within the same lot. There is noticeable changes lot to lot, but my Berger 156s from last fall, have a base to ogive 0.030 longer than the ones I acquired 4 years ago, 30 thou is a huge fn difference. I've shot a lot of 109s, 140s, 154s, and there is always variation from lot to lot, all the newer from last 2 years seem to have longer bearing surfaces than my older lots.
 
There have been a lot of matches one with DTACs, and when guys win it has a lot more to do with the Indian than the arrow.

Realistically, if a guy was cheap and had a comparator and a good enough scale, he could beat Berger or anybody else's standards just by sorting.

Generally speaking, a $.60 bullet is going to be more consistent than a $.30 bullet (for the cost difference, it should be at least). But, guys are kidding themselves if they think a bullet that costs twice as much always means it's twice as good. The differences between a random box of Match Burners and/or boring Hornady HPBT's and a box of Hybrid Target's or A-Tips isn't as vast as some might think. I know more than a couple of guys who will never even make it into the mid-pack (let alone out of it) who only shoot Bergers and/or A-Tips lol.

Cost certainly isn’t always indicative of performance, even though I’d argue it should be. Bergers definitely aren’t twice as good as any bullet nor are they twice as expensive.

Who is winning 2-day PRS matches with DTACS?

I think Nick Gadarzi is winning with Nosler RDFs and those bullets don’t have the best “internet reputation” at all. I’ve never fired a RDF so I don’t have an opinion on them.
 
Cost certainly isn’t always indicative of performance, even though I’d argue it should be. Bergers definitely aren’t twice as good as any bullet nor are they twice as expensive.

Who is winning 2-day PRS matches with DTACS?

I think Nick Gadarzi is winning with Nosler RDFs and those bullets don’t have the best “internet reputation” at all. I’ve never fired a RDF so I don’t have an opinion on them.

IDK who's won using them most recently, but guys were winning matches with DTACs a couple/few years ago, so there's no reason why one couldn't win matches with them today. Most of the top guys are either shooting for Berger or Hornady, but they could win with anything because it's their skill that makes the difference.

Too many guys play follow the leader when it comes to gear and components without testing things for themselves to see what actually matters. Most shooters would probably be better off shooting a cheaper bullet if cost-wise it allowed them to get more time behind the rifle and practice more.

There's a lot of Ford versus Chevy style brand loyalty with components where guys make blanket statements about so-and-so's bullets being terrible after only trying a 100 when their usual they've shot thousands of aren't available, when in reality the difference between their usual and the other brand isn't as big as they think lol.
 
Anyone got any suggestions for hunting bullets for 6GT? would 109 Bergers work for white tail at ~300y?
The 108eld-m (and I assume 109s) are straight murder seeds on whitetail.

I shot berger 140 elite hunters (260) last year and they are violent especially sub 100yards.

Both pics are exit side. The shoulder hole would be the armpit essentially. Shot at about 75yds
 

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The 108eld-m (and I assume 109s) are straight murder seeds on whitetail.

I shot berger 140 elite hunters (260) last year and they are violent especially sub 100yards.

Both pics are exit side. The shoulder hole would be the armpit essentially. Shot at about 75yds
We will be finding out this year about the 109 eld’s.
 
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We will be finding out this year about the 109 eld’s.
Myself as well. I have 109eld at 3080 from a 22" barrel, shoots really well, 112 Barnes at 3050 same rifle, shoots equally as well. I'll be testing these two bullets on lots of game this fall. Had great luck with the 108 elite hunter last year at 3050mv from 400-730y.
 
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Myself as well. I have 109eld at 3080 from a 22" barrel, shoots really well, 112 Barnes at 3050 same rifle, shoots equally as well. I'll be testing these two bullets on lots of game this fall. Had great luck with the 108 elite hunter last year at 3050mv from 400-730y.
Assuming this a 6GT, what powder are you using to obtain those velocities from a 22” barrel.
 
What’s the brain trust’s opinion on a short barrel GT? Thinking 20-22 running 109s or smaller.

Reality is I’ll never have time for comps so a 26inch comp tube makes no sense. Mainly a plinker to 1000 but also short range (under 500) whitetail and pigs.
The top node for 105-112gr bullets is from 2950-2900 depending on bullet weight/powder. My 24" tube will run these velocities not too far from pressure, 0.7gr, which is bout 50fps, which is what you'll lose cutting 2" off, minimum. This would make things pretty spicey. I'd run a 6cm at 20-22". No problems running the creed mid 2900s with a 20" barrel. My 22" shoots really well at 3080 with 109 eldm/ rl26.
 
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The top node for 105-112gr bullets is from 2950-2900 depending on bullet weight/powder. My 24" tube will run these velocities not too far from pressure, 0.7gr, which is bout 50fps, which is what you'll lose cutting 2" off, minimum. This would make things pretty spicey. I'd run a 6cm at 20-22". No problems running the creed mid 2900s with a 20" barrel. My 22" shoots really well at 3080 with 109 eldm/ rl26.
So let me throw this out there.

I have a 6cm (wife’s), 260 243 and several 25s. Getting rid of the 243 barrel for the GT and the gun will be run suppressed. We box stand hunt here in TX and a 24inch barrel with suppressor can turn into a circus depending on blind size lol. I’d be fine running in the 2800s. Based on data I’d be good to 500ish for my AO.
 
So let me throw this out there.

I have a 6cm (wife’s), 260 243 and several 25s. Getting rid of the 243 barrel for the GT and the gun will be run suppressed. We box stand hunt here in TX and a 24inch barrel with suppressor can turn into a circus depending on blind size lol. I’d be fine running in the 2800s. Based on data I’d be good to 500ish for my AO.
Yeah you would. Personally if she's already shooting 6cm(and you're not tooled to load 6gt), I'd just spin up another creed. There is ammo everywhere, quality brass from several vendors. Every one I've had, has shot very well, but so does a gt. You'll likely be happy with either choice, and soubd set on the gt. I personally just really like the 6cm when it comes to hunting. I've also got a 6saum, and smith is waiting on my barrel to cut a 6prc.
 
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Yeah you would. Personally if she's already shooting 6cm(and you're not tooled to load 6gt), I'd just spin up another creed. There is ammo everywhere, quality brass from several vendors. Every one I've had, has shot very well, but so does a gt. You'll likely be happy with either choice, and soubd set on the gt. I personally just really like the 6cm when it comes to hunting. I've also got a 6saum, and smith is waiting on my barrel to cut a 6prc.
That’s part of the reason I’m set on the GT is I have everything for it, brass dies bullets etc except a barrel. My 25creed is a hammer with 135s but it’s big and bulky. I may go 22inches and call it good lol
 
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What’s the brain trust’s opinion on a short barrel GT? Thinking 20-22 running 109s or smaller.

Reality is I’ll never have time for comps so a 26inch comp tube makes no sense. Mainly a plinker to 1000 but also short range (under 500) whitetail and pigs.
I'm no brain trust but, I built a 20 inch GT because I already have all the stuff for it. I have a match barrel but I rarely shoot bolt action PRS stuff anymore. Love the cartridge so I gave it a whirl. Last time out my load of 33.4 gr Varget gave these results. This was rounds 100-110 out of the new barrel. I think in the next 100 rounds or so it should settle in right around 2800fps with a berger 109lrht.

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I'm no brain trust but, I built a 20 inch GT because I already have all the stuff for it. I have a match barrel but I rarely shoot bolt action PRS stuff anymore. Love the cartridge so I gave it a whirl. Last time out my load of 33.4 gr Varget gave these results. This was rounds 100-110 out of the new barrel. I think in the next 100 rounds or so it should settle in right around 2800fps with a berger 109lrht.
That's awesome info thanks! How do you like the setup?
 
I'm no brain trust but, I built a 20 inch GT because I already have all the stuff for it. I have a match barrel but I rarely shoot bolt action PRS stuff anymore. Love the cartridge so I gave it a whirl. Last time out my load of 33.4 gr Varget gave these results. This was rounds 100-110 out of the new barrel. I think in the next 100 rounds or so it should settle in right around 2800fps with a berger 109lrht.

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That's moving right along! I just ran 107smk though the womans 26" 7.5tw Hawkhill 237 bore barrel, 33.4 and they were going 2860. Has bout 160 rounds on it. This exact load did 2950 in her prior 7tw Hawkhill. Less twist, 50k longer freebore, and lower round count must be a lot the difference. I ran same exact load of 35.8hr H4350 w/ 115 dtacs in my 30, 28" 26" barreled rifles one day, there was only 50fps between all three. These were all Alpha 170fb hawkhill 7.5tw 237 bores from same batch of steel. So not quite apples to apples, but close.
 
Really liking the setup. Not exactly light with the TCS and M24 contour but a lot handier with the suppressor on it for sure. Those 26 inch barrels are great for the game but get long quick with a can. The load is the same as it was for my 26 inch proof prefit match barrel and at this point I don't see a need to do any further development. It's nice when it goes easy for a change! The 26 inch was running 2890 fps with the same load.
 
So assume you are a complete noob, and you have the following barrel:

  • Bartlein M24 Contour Barrel (26" Finish Length)
    -1:7.5" Twist
    chamber cut with Alpha Munitions Legacy Reamer with a .120” freebore
A big jug of Varget, a bunch of virgin Alpha brass, and the following cache of bullets
  • SIerra 107 Matchking 1000 rounds
  • 106 A-Tip, 1000 rounds
  • Berger 109 LRHT, 500 rounds
  • Berger 6mm 105 VLD Target, 500 (these were supposed to be 109 LRHT, but . . . when they arrived I saw only the yellow Berger boxes and just assumed the snipershide member shipped what he said and what I paid for. Imagine my surprise when I unpacked them weeks later, a little too late to complain, lol)
Which bullets would you use to start?

I was leaning toward the 106 A-tip. These are the factory "seconds" that everybody is having good results with. Then maybe when those run out switching to the SMK 107, then maybe getting into the Bergers.

My thoughts are mainly the price. I spent by far the least on the 106 A-tip seconds, so I thought maybe to use those up as I am learning and going to the SMKs next as the next least expensive bullets.

But please share your thoughts. Which ones would you use to start? Assume you are a complete noob to hand loading. I have been shooting mainly commercial Hornady loading before and some handholds others put together.
 
@Malum Prohibitum

I'd use the 105VLD's to get a 100 or so through the barrel to get it up to speed or close and get your brass fire formed 31ish grains .020ish off the lands.

Then either bullet 106 or 107 your choice...again at .020 off the lands start at 31.5g and work up .3g at a time...CCI450 is my preferred primer.

I am shooting 108g Bergers .020 off, hornady brass, CCI450 and 32.8g Varget 24" barrel at 2800fps
 
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What’s the brain trust’s opinion on a short barrel GT? Thinking 20-22 running 109s or smaller.

Reality is I’ll never have time for comps so a 26inch comp tube makes no sense. Mainly a plinker to 1000 but also short range (under 500) whitetail and pigs.
As a point of reference, I have a 22" GT gas gun (GAP Bartlein) and get 2850 fps with 107 SMK and 6.5 Staball. 20-22" in a bolt gun would be plenty for deer, hogs and targets out to 1k.
 
@Malum Prohibitum

I'd use the 105VLD's to get a 100 or so through the barrel to get it up to speed or close and get your brass fire formed 31ish grains .020ish off the lands.

Then either bullet 106 or 107 your choice...again at .020 off the lands start at 31.5g and work up .3g at a time...CCI450 is my preferred primer.

I am shooting 108g Bergers .020 off, hornady brass, CCI450 and 32.8g Varget 24" barrel at 2800fps
I forgot to mention I have 2000 CCI 450 primers.

I already put more than 100 rounds through the barrel using Hornady Match (factory loaded ammunition). I had to stop using it due to pierced primers.

Thank you for your input.