It's a fun ride. Bonus that you picked the 6GT to learn on. It is one of the most forgiving cartridges I've found. Three bullets, three powders, and I don't think I've fired a single five shot group that has exceeded MOA.
Best of luck.
6gt
- Thread starter Dthomas3523
- Start date
It's a fun ride. Bonus that you picked the 6GT to learn on. It is one of the most forgiving cartridges I've found. Three bullets, three powders, and I don't think I've fired a single five shot group that has exceeded MOA.
Best of luck.
Well shitYou asked in this post: https://www.snipershide.com/shooting/threads/6gt.7053224/post-11523601
About brass options, a few of us chimed in... Hornady brass in 6GT is WELL DOCUMENTED to suck balls. So, anecdotal stories are what you're gonna get. YMMV.
This particular person is a known gunsmith and ammo FFL (and a member here)... So, I'm pretty damn sure he knows what he is doing.
Like I said, I have multiple seasons and tens of thousands of rounds with 6GT, so take that as a clueless opinion. I ran my first season in 6GT with Hornady brass. I learned my lesson the hard way, I'm simply promoting that people don't make the same expensive mistake.
Good luck
Now I have to buy some Hornady brass just to see if I get case head separation in two firings..
I'll put up honest results when I get the barrel
I can answer that …my Hornady brass is on its 5th firing no case separation primer pockets are good. Feel pretty confident I can get a couple more firings so was worth the money. I have a few hundred Alpha but haven’t loaded them yet.
Did you need to do any tuning? I have just 2 of these. They would not feed 6.5 at all. Seemed quite altered with 6gt with the case base dipping easily, however they would seem to feed fine. Still trying to diagnose the issue.
I just got a couple of these new 12rnd amend2 poly mags to try. Cycled 12 rounds through both my 25x47 and 6gt and they worked great, no hiccups. They are slightly longer than a mdt 12rnd by .33" but shorter than a AICS 10rnd with a +2 extension on it. Max coal is at or real close to 2.9"
Anyone have the Berger page for the 105 Load data? Please 
and thank you
and thank you 
I have with 107 SMK’s, I’m actually looking for a place to start with 105 Berger’s I just got.
Use the same start data as the 107s. All the QL data I’ve gotten from Berger has been very conservative.
I am building a 6mmGT as a light, 18 inch barrelled rifle.
In my chosen contour/make of barrel, I can get a 1:8" twist easily and may have to wait a long time for a 1:7.5". I would prefer a 1:7.5" twist, but I am non-USA so parts availability is an issue.
I want to shoot the 108gr ELDM (actually 109gr ELDM but as I'm non-USA and they seem to be GAP exclusive, I'm shit out of luck - @A10XRIFLE hook us internationals up)
If the 108 ELDM doesn't shoot in my barrel, it looks like a 105, 108, 109 Berger, 103 ELDX, etc will work as backup options with stability in a 1:8. I want good terminal performance hence my preference for the ELDM (I use these in .22 and 6.5mm with excellent effect)
I expect to get up to something in the range of 2750-2850FPS using Varget/H4350 and Alpha or Lapua brass (if it becomes available).
Has anyone got experience with a 1:8" 6mmGT and the 108gr ELDM, or any of these other bullets? Have you experienced stability issues?
In my chosen contour/make of barrel, I can get a 1:8" twist easily and may have to wait a long time for a 1:7.5". I would prefer a 1:7.5" twist, but I am non-USA so parts availability is an issue.
I want to shoot the 108gr ELDM (actually 109gr ELDM but as I'm non-USA and they seem to be GAP exclusive, I'm shit out of luck - @A10XRIFLE hook us internationals up)
If the 108 ELDM doesn't shoot in my barrel, it looks like a 105, 108, 109 Berger, 103 ELDX, etc will work as backup options with stability in a 1:8. I want good terminal performance hence my preference for the ELDM (I use these in .22 and 6.5mm with excellent effect)
I expect to get up to something in the range of 2750-2850FPS using Varget/H4350 and Alpha or Lapua brass (if it becomes available).
Has anyone got experience with a 1:8" 6mmGT and the 108gr ELDM, or any of these other bullets? Have you experienced stability issues?
VV N150 will work for sure. Just tried it today for the first time...no issues.
I think I've seen RL16 being used here, but that stuff is rare and expensive! VV N555 might work if not too bulky or slow burning.
105 Hybrid at 1.947 CBTO
1x fired Alpha
Fed 205MAR
N150 and H4350
Cleaned my 27" Krieger back to bare metal after 200 rounds and started a little more load development today.
Took a stab in the dark with N150, and also shot a few groups with the same charge weight range of H4350 that my barrel prefers the 108gr ELD-M with.
Both times I ran out the top end for accuracy, and the groups opened up on the last charge.
*Just 5 shots per.
N150 after a single fouling shot:
Then I tried H4350. Lowest was best, with the next throwing a shot out, and the final highest charge spitting out two shots (still was a .5).
Looks like I have just a little verifying to do and then I'm good.
ES and SD were everything I could hope for. I know...small sample sizes, but with that many I think there is some consistency there.
1x fired Alpha
Fed 205MAR
N150 and H4350
Cleaned my 27" Krieger back to bare metal after 200 rounds and started a little more load development today.
Took a stab in the dark with N150, and also shot a few groups with the same charge weight range of H4350 that my barrel prefers the 108gr ELD-M with.
Both times I ran out the top end for accuracy, and the groups opened up on the last charge.
*Just 5 shots per.
N150 after a single fouling shot:
Then I tried H4350. Lowest was best, with the next throwing a shot out, and the final highest charge spitting out two shots (still was a .5).
Looks like I have just a little verifying to do and then I'm good.
ES and SD were everything I could hope for. I know...small sample sizes, but with that many I think there is some consistency there.
I want to try that one and I heard N140 is good.
Yes, I know others who tried RL16 and had good results but like you said, rare and expensive, just like H4350
I tried 33.2, 33.5, 33.8 N150 in post #1,887 above.
Surprisingly my ES and SD went up with each charge weight.
I'm going to add a screenshot of the post where I saw the only load data for N150 so far:
I had my 26” criterion cut down to 20” and only lost 80fps wjth the same load. Thats 13.3 fps per inch.
I’m at 34.2 varget 112 match burners.
I took 10 rounds to the range to test, 1 to make sure I was on paper (new scope)
9 shot group, here’s the data.
I’m at 34.2 varget 112 match burners.
I took 10 rounds to the range to test, 1 to make sure I was on paper (new scope)
9 shot group, here’s the data.
Has anyone tried N140? Just got my barrel and I'm about done paying ludicrous H4350/Varget prices
Just curious why you shortened the barrel? Scientific curiosity? Easier to handle indoors? Shorter overall length when using a silencer? Easier to use on the five rungs that F@#king lightweight aluminum stepladder the match director set up for one of the stages?
I hate long barrels. Always have. Even more since I started shooting with a can years ago. I saw someone on the 6gt FB page that had the same load as me and cut theirs to 20” and had good velocity, so I went for it.
I wish I would have cut it to 18” and upped the charge .2gr or so to keep it at 2800.
Did a depth test this morning.
This was the last 5, mirage was trying to mess with me but I’m happy with this load and rifle.
This was the last 5, mirage was trying to mess with me but I’m happy with this load and rifle.
I don't think N160 will be optimal for sure, but you could probably get it to work if you had to. I just looked at some burn rate charts, and it is a lot closer to H4381 than it is H4350.
IMO N160 is going to be better once you get up to 6CM. N150 however is right up there with powders I've had good luck with.
Here is another 6GT load data point:
Sierra 107 SMK
34.0 grains Varget
BR4 Primer
18 rounds fired
21.5" barrel - 1/7.5 twist
Min 2905
Avg 2915
Max 2935
ES 29.5
SD 7.2
Dialed 2.9 Mils at 600 yards
Sierra 107 SMK
34.0 grains Varget
BR4 Primer
18 rounds fired
21.5" barrel - 1/7.5 twist
Min 2905
Avg 2915
Max 2935
ES 29.5
SD 7.2
Dialed 2.9 Mils at 600 yards
Very well. We were shooting at 600 and I did not measure group size. My previous 5 shot group size with the same load at 100 was .325 MOA.
I'm 30 rounds deep in my proof competition contour 6GT barrel, so far N150 and H4350 are shooting great around 2850 with Dtacs.
Just for fun I loaded 112 match burners up today with 39 grains N160, 6 shots total averaged 2825 with an SD of 12.
The 1" group is .025 off the lands, the other .050 off.
Just for fun I loaded 112 match burners up today with 39 grains N160, 6 shots total averaged 2825 with an SD of 12.
The 1" group is .025 off the lands, the other .050 off.
Looks like there's promise, and that you're not losing too much velocity with the N160...although I'm guessing 39gr of it is getting compressed a bit.
Yep slight crunch but not to the point of affecting seating depth consistency, I'll bet it'd be really good in a 6 creed
I'm sitting on 8lbs of it myself for my next 6CM barrel.
My barrel is loving 112 MBs .060 off the lands with a mild 36 grains of H4350, it's averaging 2825 and hasn't sped up yet.
Yeah I’ve been real impressed with these 112 MB in the 6GT.
Looks nice. How are they shooting at distance for you?
What ES or SD are you getting with the 4350?
In general the 112s shoot awesome at distance, but I haven't taken this rifle out beyond the 100 yard line yet.. Hopefully this weekend.
SD isn't awesome at 12 but it's virgin brass so maybe it'll improve a little on the 2nd firing.
Jumped on the 6gt bandwagon last week after getting my barrel. I'm having issues using the rcbs precision mic tool to find the lands. No matter how loose or tight I make the set screw, the "bullet" of the mic is getting stuck in the lands. Sanity check, I measured the "bullet", 0.2425 inches.
I used a rcbs precision mic on my 6.5 creed no issues. This is my first 6mm family adventure. I have a modified case coming to try that way.
I used a rcbs precision mic on my 6.5 creed no issues. This is my first 6mm family adventure. I have a modified case coming to try that way.
Multiple ways of finding the lands. I used to use the Hornady kit, but the results from multiple tests frequently spanned .010, so I guess I must have been doing it wrong.
Nowadays I just use a piece of fired brass, and I lightly coat the back of the bullet's bearing surface in blue Loctite before loosely putting them together (long). I wipe the excess off before chambering, close the bolt which pushes the bullet the rest of the way back, and then let it sit ~30 minutes. It is an easy clean up, a case neck brush and about 10 seconds and the brass is reusable.
There are better ways, but this one works for me.
I think you'll like your GT. Best of luck.
Lord have mercy…….The Hide keeps revealing ways for me to spend money.
Forever a poor…….but I’ll have some cool gear.
Has anyone tried any of the ELD-VT bullets in their 6GT? I called and talked to GAP and they were messing around with them, but no load data to share. They recommended joining the facebook forum, but its been weeks and haven't been added to the group.
Took the left load (below photo) out to 655 today to verify velocity and see if accuracy would hold up. Normally I do that at 300, but I had cows in the way.
Wind was super mild, only about a 1-2 MPH crosswind, so i just held dead on. I usually gain ~30 FPS when I true velocity over my cheap chronograph, but this time I lost that much.
Took a tape measure to it. 2-1/4" on the nose. I know, only five shots, but I'll take it. The 105 Hybrid seems to hover around 3/8 MOA in this barrel with multiple powders. This group may have been a fluke...but that's happened a couple times now. Vertical was only about an inch.
27", 1:8, Krieger. Chambered by Matt Stewart.
105 Hybrid, 36.7gr H4350, Fed GM205MAR, 1x fired Alpha, 1.947 CBTO.
Wind was super mild, only about a 1-2 MPH crosswind, so i just held dead on. I usually gain ~30 FPS when I true velocity over my cheap chronograph, but this time I lost that much.
Took a tape measure to it. 2-1/4" on the nose. I know, only five shots, but I'll take it. The 105 Hybrid seems to hover around 3/8 MOA in this barrel with multiple powders. This group may have been a fluke...but that's happened a couple times now. Vertical was only about an inch.
27", 1:8, Krieger. Chambered by Matt Stewart.
105 Hybrid, 36.7gr H4350, Fed GM205MAR, 1x fired Alpha, 1.947 CBTO.
Shot first 30 rounds out of my first 6mm barrel and 6gt yesterday and today. Got all the way to the range and realized I forgot my cleaner for break in 
.
First 10 were a light load of h4350 at 34.5gr. Dry patch clean after every 3 shots. Gave it a good cleaning back at the house. Two wet patches and the barrel was clean.
Today I loaded 20 rounds, 5 each of 0.03, 0.04, 0.05, and 0.06" off the lands. 36.5 H4350, 109 Bergers. Forgot how much I love berger. Every bullet I weighed was 109.0gr.
Groupings were meh, 1 moa to half moa.
Speed was 2850-2868 fps.
One thing that has me puzzled is the bolt is difficult to close. Opening it after each firing was no issue. I've confirmed I'm not stuffing the bullet into the lands. Virgin Alpha OCD 6GT brass.
With the barrel off, the cases are snug when I manually insert an empty case.
Any suggestions? Planned on shooting this barrel at GAP's range this weekend for a match. Wondering if I should spin the 6.5c back on.
.First 10 were a light load of h4350 at 34.5gr. Dry patch clean after every 3 shots. Gave it a good cleaning back at the house. Two wet patches and the barrel was clean.
Today I loaded 20 rounds, 5 each of 0.03, 0.04, 0.05, and 0.06" off the lands. 36.5 H4350, 109 Bergers. Forgot how much I love berger. Every bullet I weighed was 109.0gr.
Groupings were meh, 1 moa to half moa.
Speed was 2850-2868 fps.
One thing that has me puzzled is the bolt is difficult to close. Opening it after each firing was no issue. I've confirmed I'm not stuffing the bullet into the lands. Virgin Alpha OCD 6GT brass.
With the barrel off, the cases are snug when I manually insert an empty case.
Any suggestions? Planned on shooting this barrel at GAP's range this weekend for a match. Wondering if I should spin the 6.5c back on.
It is virgin brass. Just as an experiment: Did you try a full length resize and then insert the brass to see if it is snug?
Ran into an issue at a match last weekend. Had 2 lots of powder and rounds were mixed in so i was sending shots way high. Super frustrating.
Came home and took 40 lbs of H4350, dumped into a bin, mixed it together then put back into 8 lb jugs. Should help with lot to lot issues.
Came home and took 40 lbs of H4350, dumped into a bin, mixed it together then put back into 8 lb jugs. Should help with lot to lot issues.
Sending all my cases through the fl sizing die fixed that issue of difficulty closing the bolt.
I'm out of time for load development. Leaving for KC tonight for the match tomorrow.
35gr of varget .040" off the lands was one hole, about 3/8moa. I'll take it. But I had heavy bolt lift and light ejector marks on the brass. Tried 34gr this morning. Grouped ok at 100. I'll give it a go tomorrow.
I'm out of time for load development. Leaving for KC tonight for the match tomorrow.
35gr of varget .040" off the lands was one hole, about 3/8moa. I'll take it. But I had heavy bolt lift and light ejector marks on the brass. Tried 34gr this morning. Grouped ok at 100. I'll give it a go tomorrow.
34/35 grs of varget is a stupid hot load. No wonder you are having issues. Add heat/moisture and a dirty gun, it's only going to get worse. Knock 2-3 grains off and try again.
Do you mean H4350? Cuz 35 gr of Varget is crazy fast and a good way of killing a barrel, or worse...
Yup learned that today at the GAP/MOST match today. Going to try 32-33gr. Wasn't seeing really any pressure signs today but my rifle did go down 3 shots away from cleaning a stage.
Many thanks to the guys that helped me out to get my rifle back up.
Many thanks to the guys that helped me out to get my rifle back up.
