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Range Report 6GT Project/Range Report
- Thread starter NorCal Vu
- Start date
Ran my 6GT today here are the stats.......this looks to be what I will run being that I won't run the hot node. Really digging this cartage.
6GT Stuteville Precision 26 inch barrel Impact Action Gen III Fat Bastard 5 port break
34.6-34.8 Varget was the sweet spot single hole 5 round groups on a lower node, loaded on twin Charge Masters
109 Berger Hybrid 50 thou off
Alpha Brass .267 neck tension, 2nd firing
BR4 Primer
2940 FPS 34.6 Varget SD 4.1 ES 9
2950 FPS 34.8 Varget SD 3.2 ES 7
6GT Stuteville Precision 26 inch barrel Impact Action Gen III Fat Bastard 5 port break
34.6-34.8 Varget was the sweet spot single hole 5 round groups on a lower node, loaded on twin Charge Masters
109 Berger Hybrid 50 thou off
Alpha Brass .267 neck tension, 2nd firing
BR4 Primer
2940 FPS 34.6 Varget SD 4.1 ES 9
2950 FPS 34.8 Varget SD 3.2 ES 7
I run a a 6 comp match with h1000
The whole basis for the longer barrel life is a few things.
Powder, cooler and slow...
Velocity, I have a fast load and normal load. On a barrel run at 2990 or so I am north of 2k rounds. I had a barrel i ran 3160 ish and at 1800 it was 100% done.
Speed kills!
There are articles from the inventor the talk about the throat care and the gains with that also.
I'm not making any crazy or elaborate claims so calm down. I will say I get better life from my comp match than my 6 creed. If kept to moderate velocity 2500 is attainable. I said attainable not 100% consistent.
Chad at LRI has a good article on it.
Bottom line throats were and barrels get fire cracking. It's a matter of balance. I like the comp match because every few barrels it's like a free barrel for me if I run it moderate.
Remember SOME of the long barrel life numbers with 6br are at 2850 velocity. If we ran that slow barrwl life would probably increase also.
And most Bench rest shooters I used to know never ran barrels as hot as we do.
Theres no free lunch trying to run 2900 fps or faster.
And most Bench rest shooters I used to know never ran barrels as hot as we do.
Theres no free lunch trying to run 2900 fps or faster.
Running the 115 rdf at a slow node with H4350 (36.2 grains). Found another node at 37.7-38 grains, but loads are getting compressed. It consistently shoots a 5 SD testing it on multiple days/temperatures. Going to run this and see how it goes because it's crazy consistent and the bc is trueing up much higher than advertised. Groups are consistently in the .4 range. Hoping to extend barrel life and have consistency over the life of the barrel.
Using Hornady brass and a 24" proof CF barrel with TBAC Ultra 7.
Using Hornady brass and a 24" proof CF barrel with TBAC Ultra 7.
Saw a post on FB stating today that 6GT is finicking with a narrow accuracy node/nodes......I am find that not to be the case with my 6GT just seeing what others have experienced. There was a giant dog pile with a few people saying that is worse than a Dasher by alot......heavy trolling
Where was this?
Except for some issues I had with alpha brass, I found it to be easy to load for.
Though I’m finding most who have issues with load development are still doing things circa 1980.
Yeah, super finicky. This was my 10 shot Saterlee test to get started...
So, gauging interest. Hypothetically speaking, wound anyone be interested or think people would be interested in a 6gt Lapua package deal that consisted of:
Barrel chambered with .270 neck
Your chosen amount of 6gt lapua brass (fireformed and turned, hence they tighter neck)
Proper bushing, mandrel, and load/node data that should be very close considering same barrel/chamber specs
Also available hornady or alpha brass turned for tighter chamber. Or lapua, hornady, or alpha skim turned for the .273 standard chamber (takes longer in lathe I use for skim turning, so probably a slightly higher price).
Most people either don’t bother with turning because they don’t want to do it, or they incorrectly think turning is only done to fit chambers. So just spitballing ideas in which to offer turned brass without the hassle in several different options.
Barrel chambered with .270 neck
Your chosen amount of 6gt lapua brass (fireformed and turned, hence they tighter neck)
Proper bushing, mandrel, and load/node data that should be very close considering same barrel/chamber specs
Also available hornady or alpha brass turned for tighter chamber. Or lapua, hornady, or alpha skim turned for the .273 standard chamber (takes longer in lathe I use for skim turning, so probably a slightly higher price).
Most people either don’t bother with turning because they don’t want to do it, or they incorrectly think turning is only done to fit chambers. So just spitballing ideas in which to offer turned brass without the hassle in several different options.
Josh at PVA posted that on FB, some guy asked how the GT was. So far I've had no issues with accuracy 300rds and probably have 4-5 groups that where over 1/2 out to 400. Multiple charges seating depths etc..
For the lurkers or readers.... regarding the "problems" folks are having regarding pressure with Alpha GT...it's likely a FL sizing die base dimension issue.
Measure at the ".200" line, if you put a case on your bench, .200 up from the case head, measure the diameter of a virgin, fired "clicky/sticky" case, fired no "clicky/sticky" case, and FL sized case where your bumping the shoulder .003-.004.
A pair of calipers will have hard time picking up the measurements if your FL sizing die is on the edge, best to use a dial micrometer that can measure to the .0001.
You should ideally see .0015-.0020 reduction in base diameter of a fired case after sizing. If you don't, you're gonna get "clickers" or see premature signs of pressure.
Just like lot variations in bullets, primers, barrels, reamers etc, dies are no different. You need to qualify your tooling, and your use of it.
I still prefer Lapua, but the Alpha 6 GT I've used is excellent quality brass.
If you've got a big FL sizing die, and a min spec chamber, you look uninformed blaming your lack of knowledge or experience on "brass problems".
Measure at the ".200" line, if you put a case on your bench, .200 up from the case head, measure the diameter of a virgin, fired "clicky/sticky" case, fired no "clicky/sticky" case, and FL sized case where your bumping the shoulder .003-.004.
A pair of calipers will have hard time picking up the measurements if your FL sizing die is on the edge, best to use a dial micrometer that can measure to the .0001.
You should ideally see .0015-.0020 reduction in base diameter of a fired case after sizing. If you don't, you're gonna get "clickers" or see premature signs of pressure.
Just like lot variations in bullets, primers, barrels, reamers etc, dies are no different. You need to qualify your tooling, and your use of it.
I still prefer Lapua, but the Alpha 6 GT I've used is excellent quality brass.
If you've got a big FL sizing die, and a min spec chamber, you look uninformed blaming your lack of knowledge or experience on "brass problems".
I set my die up to where fired brass would free fall the bolt with no firing pin assembly or ejector and it ended up needing .004 of bump. That’s about double that I ever sized a fired case.
I anneal with an AMP every firing so I hope my brass doesn’t split from working that much. I usually only bump shoulders about .0015.
I anneal with an AMP every firing so I hope my brass doesn’t split from working that much. I usually only bump shoulders about .0015.
It shouldn’t. I usually bump .002-.003 without issue. Guys bump almost double that for gas gun.
You're setting it up perfectly. The reason your measurements show .003-.004 is because there's never a perfect match between the shoulder angle in your chamber and your FL sizer and the datum on your comparator.
More references towards a # being a "gas gun" number only go to show the level of misinformation that's available for consumption.
No one referenced it as being a gas gun number. Nor was it suggested he did not size the brass properly.
It was a comparison to how more shoulder bump will not work the brass enough to damage it. As there are people bumping more without issue.
Read carefully before you post again.
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I try to limit my posts to topics I’m knowledgeable about, so as to not mislead others.
Did you ever get your “brass issues” worked out.
Soft case head in some batches is the general consensus among several who have looked at it. Without hardness tests no way to verify.
Dies are sizing properly. Hornady factory brass and formed lapua works fine.
I would take information you get from FB with a grain of salt. Lots of rhetoric and group think on FB, I can't stand the precision rifle groups on there.
info regarding life on 6GT
1645 rounds on barrel #1
Shot mostly 105 and just recently got the 109s.
Running H4350 with spartan rifles cut bartlien barrel 27 inch heavy palma 5R with 37 grains
H4350
Some velocitys running @ 3018 for 105 and 3005 for 109 . .020 off lands for the 105 and .030 for 109.
So far been running the hornady brass with 105 and alpha with the 109's ( new addition)
Single digit sds in most of the loads ,never above 5-6 even with virgin brass , after prep sized anealed and autotrickler loaded , typically in the low 2-3 sds
Measured new @ throat at 1.960 to lands .
And currently @ 1645 at 1.999 to lands
Same bullet for measurements from 0 to 1645
Keeping the .020 thou jump with rounds with 105 hybrid . And added recently the 109 to the mix so unknown on throat wear@ this time.
Will update when have more data on the 109s
1645 rounds on barrel #1
Shot mostly 105 and just recently got the 109s.
Running H4350 with spartan rifles cut bartlien barrel 27 inch heavy palma 5R with 37 grains
H4350
Some velocitys running @ 3018 for 105 and 3005 for 109 . .020 off lands for the 105 and .030 for 109.
So far been running the hornady brass with 105 and alpha with the 109's ( new addition)
Single digit sds in most of the loads ,never above 5-6 even with virgin brass , after prep sized anealed and autotrickler loaded , typically in the low 2-3 sds
Measured new @ throat at 1.960 to lands .
And currently @ 1645 at 1.999 to lands
Same bullet for measurements from 0 to 1645
Keeping the .020 thou jump with rounds with 105 hybrid . And added recently the 109 to the mix so unknown on throat wear@ this time.
Will update when have more data on the 109s
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Finally got my 6GT out! Barrel is a Krieger pre-fit chambered by Keystone Accuracy for my Bighorn Origin.
Despite 20+ mph winds and having to single feed(forgot mag) it shot in the .2’s and .3’s with my generic break- in loads at 100 yards.
Load is: 35.5 grains H4350 with a Hybrid 109 in Hornady brass, CCI 450. COAL of 2.59”. Can’t wait to keep shooting it and see where my accuracy/velocity nodes end up.
Despite 20+ mph winds and having to single feed(forgot mag) it shot in the .2’s and .3’s with my generic break- in loads at 100 yards.
Load is: 35.5 grains H4350 with a Hybrid 109 in Hornady brass, CCI 450. COAL of 2.59”. Can’t wait to keep shooting it and see where my accuracy/velocity nodes end up.
Anyone know what caliber conversion works on a Dillon 650 and the GT? Want to start sizing and running mandrel die on the dillion to speed things up.
Ill throw powder and seat bullets on the Co-ax.
Ill throw powder and seat bullets on the Co-ax.
Lol. The only FB group I’d pay attention to is the original 6GT group that has George Gardner and Tom Jacobs I’m as well as many too PRS shooters. Some really good info posted on there with little bullshit. As far as being “finicky” to load for, I think that’s a load of shit. I had to get a new barrel on mine because the first one had a groove in the chamber from a chip on the reamer. Shot 5 round groups every .1 grains with Varget and had a .7 grain spread that ever group was below a 6 SD and they all grouped great. 
Impact Bartlin 26” barrel
105 Bergers
35 thou off lands
35.0gr varget
Fed small rifle primers
mv 3020
Hornady Brass
sd 5, ties knots
I started with that, and I could no do anything wrong I messed around seating between 10thou and 70thou and it just worked all the time. Settled a little deeper than 20, seemed to be the sweet spot.
After 400rds, and a recent match, I had a little increased velocity and also some extractor swipes, primers flattening a little bit.
Backing down to 34.5 for summer, just looking for that 3015 spot, no need to push too much more.
6GT has been simply one of the easiest most forgiving rounds I’ve loaded for. Granted that’s with one barrel, we’ll see how the next one goes.
105 Bergers
35 thou off lands
35.0gr varget
Fed small rifle primers
mv 3020
Hornady Brass
sd 5, ties knots
I started with that, and I could no do anything wrong I messed around seating between 10thou and 70thou and it just worked all the time. Settled a little deeper than 20, seemed to be the sweet spot.
After 400rds, and a recent match, I had a little increased velocity and also some extractor swipes, primers flattening a little bit.
Backing down to 34.5 for summer, just looking for that 3015 spot, no need to push too much more.
6GT has been simply one of the easiest most forgiving rounds I’ve loaded for. Granted that’s with one barrel, we’ll see how the next one goes.
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What bullet and weight? Still waiting on a barrel, but might put together 50 rounds for break in, I have 109 Bergers.
Whoops that ought to have been included, my mistake.
Berger 105s strongly considering trying 109s next.
I have it out today still getting 3040 with 34.8, I’m knocking that back a bit, still seeing some pressure signs too. Considering 34.5 next batch of virgin Hornady.
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I must have been blocked or banned for some reason. I cannot find it.
I didn’t even do anything but give George money lol wtf.
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yup it just loads and loads. Will not pull the page up.
Wonder who the mods are so I can message them and see what’s going on.
The only thing I ever asked was about a reamer and when GAP would get stuff back in stock. If I was banned I would like to know why or what happened.
I just stopped seeing post about the GT one day and was like why can’t I find the group. Thought maybe I went crazy.
Anyone else have mag feed problems. Mine will will want to nose dive every now and then. Pain in my ass. Impact, foundation and Hawkins bottom metal.
Mine does it too but I looked at my mags and the lips need to be adjusted. They are too far apart.
Hell I bought 2 new mags Samething. I can load all the rounds about .200 forward and they feed like butter. I was thinking about making an insert to keep them pushing back.
The couple times I mentioned it on FB groups they are part of, they blamed it on anything an everything you can imagine. So, I didn’t reach out to them privately about it, so I’m not sure how they would handle it that want. Wasn’t impressed with public response. Won’t be using alpha for any brass going forward. Had issues with dasher brass as well.
Hornady factory brass and my own lapua 6gt work fine.
Does anybody have a load for 95 grain bullets with their GT.? I purchased some patriot Valley 95 green Seneca competition bullets. Just looking for a place to start. Been running the burger 105 hybrid with 34 grains of varget at 2950 FPS. May start with 33 grains of varget thoughts
My barrel is finally ready. I stopped by today to check and they were just waiting on Cooper Creek to deliver some test ammo. I had 50 rounds loaded in the car just in case, so dropped them off. They won't chamber. I must have read the reamer print wrong, because I thought i had 40 to the lands. I have new Alpha brass and 109 Bergers. Could some of you nice folks tell me what your CBTO and COAL is with the 109's? I need to reseat and would like to do it once.
Thanks to all, can't beat this place for good information.
Thanks to all, can't beat this place for good information.
Hello All... Excited to join the party!!! This is my 6GT and my first bolt rifle. Only been reloading since Christmas. 40% of these are below 10 SD and This is only shots 26 through 100 through a new barrel, brass and rifle. Can’t ask for more...
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thank you. Berger 105s Staball, H4350 and Varget tested.Best SDs are in the 2925 to 2975 FPS range. This is brand new Hornady brass with CCI450
Ok. With Hornady brass and CCI 450 many shooters have found a load right at 34.5 Varget. Try between 34.3-34.7. For me it was 34.6 for both 105 hybrids and 110 A-Tips, and 34.5 for the 109 hybrids.
