6gt

[MOshooter]

Anybody running Hornady 106?

Hornady 106gr A-tip factory seconds

I saw powder valley has 106gr tipped bullets on sale. Was told they are 106gr Atips and they're factory seconds because the firsts are for DOD 6 ARC contracts at the moment. Anyone tried these and have any results they could share?

www.snipershide.com

I've been playing with these in a 6CM.
Haven't tried them in my 6 GT yet.

 

[DubfromGA]

Definitely won't have OAL issues.

105 Hybrid, 107 SMK, 108 ELD-M have all done pretty well so far in my .120 freebore chamber. I bet your 109 does well too, and you might want to give those a try before you start buying other components.

These 109gr ELDM may be the only game in town….unless I mail order.
I am glad I grabbed them when I did.

Ran by the local Cabelas & Academy earlier…..hoping to pick up some 107gr SMK and / or 105gr Hornady Match. No luck. No 6mm Bergers of any kind, either.

 

[mdram]

These 109gr ELDM may be the only game in town….unless I mail order.
I am glad I grabbed them when I did.

Ran by the local Cabelas & Academy earlier…..hoping to pick up some 107gr SMK and / or 105gr Hornady Match. No luck. No 6mm Bergers of any kind, either.

mail order is often cheaper

 

[DubfromGA]

mail order is often cheaper

True that.

Planning to get my mess organized.

Once I have loads dialed in for various guns I'll know then what to maintain on my wishlists and order when prices, shipping costs, hazmat & etc are most favorable.

 

[DubfromGA]

mail order is often cheaper

Looks like Midway has a couple that I wanted to try. Prices are better than some and they have free shipping at the moment.

Gonna grab some 105's to try.

 

[Kaveman44]

Looking for some feedback. I just received my second 6GT barrel. My first one I was running Berger 109 hybrid’s with 33.2 grains of varget at 2850fps. I’m looking to slow it down to just over 2700 fps, what would you think I should start my Varget at to get close to the 2700 fps? If I had a range close to me, it would be easy but I have to drive a couple hours each way to my range. Thanks Jimmy

 

[4O6shootist]

@Kaveman44 case fill will be very low 31-31.6 gr of varget to get your desired speed. This may results in poor es/SD. I think you'd be better off loading with a slower powder like H4831SC rl23 or N160 and keep the density up over 90-95% for consistency of ignition. Only desiring 2700-2750fps is perfect 6br country, or chop 4-6" off your current setup.

 

[Niles Coyote]

I've been running 32 grains in what seems to be a tight bore Proof barrel. I have gone as low as 31.5 grains of Varget with no ill effects. 32gr is my primary load though and yields 2830, but this barrel has also trended about 40-50 fps faster than all my previous bartlein and benchmark barrels.

 

[Kaveman44]

I guess I need to figure out what would be the lowest I could go and still be accurate. I just hate that I have to drive so freaking far to the range.

 

[Niles Coyote]

I'd load up a few at 31.0, 31.5 and 32.0 with Varget, don't be afraid to jump your bullet, I seat for a .055-.060 jump with 109 hybrids and haven't had to change it for the life of three barrels now. Lately I have been doing the same with 108 elite hunters.

 

[Malum Prohibitum]

Looking for some feedback. I just received my second 6GT barrel. My first one I was running Berger 109 hybrid’s with 33.2 grains of varget at 2850fps. I’m looking to slow it down to just over 2700 fps, what would you think I should start my Varget at to get close to the 2700 fps? If I had a range close to me, it would be easy but I have to drive a couple hours each way to my range. Thanks Jimmy

I am just curious why you want to slow it down to 2700 fps? What was wrong at 2850 fps?

Wouldn't heavier rounds, like 115 grain help with the goal of slowing it down?

Sorry for three questions in one post, but I am ignorant and curious, which is a bad combination.

 

[NiteQwill]

I am just curious why you want to slow it down to 2700 fps? What was wrong at 2850 fps?

Wouldn't heavier rounds, like 115 grain help with the goal of slowing it down?

Sorry for three questions in one post, but I am ignorant and curious, which is a bad combination.

Could be a combination of barrel life, barrel length, or just experimentation.

I ran a whole PRS season in 2022 with 6GT going 2635 with 115 DTAC. It was fun.

 

[4O6shootist]

Could be a combination of barrel life, barrel length, or just experimentation.

I ran a whole PRS season in 2022 with 6GT going 2635 with 115 DTAC. It was fun.

Curios what powder you ran for this? I am planning on going down same route, but plan run next node up mid 2700s. Was going to attempt it with a full case of Rl23.

 

[Kaveman44]

I’m hoping to help myself see more impacts. Now with that little of a difference help, I’m not sure.

 

[4O6shootist]

I’m hoping to help myself see more impacts. Now with that little of a difference help, I’m not sure.

I went from 115dtac at 2860 in a gt, to 154 Berger at 2620 and I see more at low speed even with the added recoil of 65cm. That bullet is a monster in the wind too.

 

[Jefe's Dope]

I thought I read that Brian Litz stated that case fill didn't affect SDs and ES as much.

 

[CK1.0]

I'm a huge proponent of going as slow as you can until things go to shit accuracy-wise so that you can see more.

The way I see it, we're just looking for consistent combustion, speed isn't the problem, anything ~2700fps or maybe even slower is fine if it still shoots. I don't believe in nodes, but I think there may be a tipping point where the fuel/air mix in the case isn't where it needs to be and where things may get wonky, and that's probably what we need to look out for when figuring out how slow one can go...

I just put on a new barrel and it's running ~2850fps after only 60rds through it (so it'll likely speed up a bit more, and I haven't decided if that's too fast for me yet). This is with 33gn of Shooters World Precision Rifle (aka Lovex SO62, Varget-alike) and a 106gn A-Tip. I had been getting ~2800-2750fps with the same 33gn SWPR and a 112 Match Burner, and that seemed to be great for helping my brain catch up with my eyes inside 600 yards. So I may slow things down.

I'm on the fence about how much case fill effects SD/ES as I've never gone higher than 34gn of SWPR in the 6GT and have went down to 32.5gn and my SDs stayed pretty consistent at ~6.0 (sometimes stupid low like SD 1-2 over 5 shots when checking it now and again). Ds of 1 over

 

[NiteQwill]

Curios what powder you ran for this? I am planning on going down same route, but plan run next node up mid 2700s. Was going to attempt it with a full case of Rl23.

Varget

 

[combatgrunt84]

I must have a snail barrel lol I’m at 32.8 grains of Varget at 2815. That’s with an MPA match barrel has 200rnds down it with 109’s

 

[Niles Coyote]

I thought I read that Brian Litz stated that case fill didn't affect SDs and ES as much.

 

[Kaveman44]

I’m gonna load up 10 rounds each of 31 grains , 31.5 grains, and 32 grains and see where my SD’s are as well as MV. I should be close to my 2700 fps with all these since I’m at 2850 fps at 33.2 grains. Thanks Guys

 

[drglock]

Could be a combination of barrel life, barrel length, or just experimentation.

I ran a whole PRS season in 2022 with 6GT going 2635 with 115 DTAC. It was fun.

I ran my GT last season at 2775 with the DTACS and felt it was as smooth as can be. My load this year so far is DTACS at 2810 and have zero problems spotting shots or trace. At least when this damn mirage will allow it. Last two matches have had the worst mirage I’ve ever shot in.

 

[4O6shootist]

I ran my GT last season at 2775 with the DTACS and felt it was as smooth as can be. My load this year so far is DTACS at 2810 and have zero problems spotting shots or trace. At least when this damn mirage will allow it. Last two matches have had the worst mirage I’ve ever shot in.

It's that time of year. Mornings here are in the 20s, mid day its 55-65° and mirage is like pea soup, thick af.

 

[diggler1833]

I don't have a lot of hope for barrel longevity in my 6GT, but it is a fun project. I started out with 100 rounds of factory Eagle Eye 105gr Hybrids. After a slight seating depth tweak (was getting 4+1groups), I shot 3 consecutive 5-shot groups that agg'd about .4 even. Ran the last 5 over a chronograph after about 125 rounds down the tube - 2,964 with an ES of 12 and an SD of 4. Too bad that stuff is so expensive. But I got the Alpha brass to mess with. **27" Krieger barrel **

I already knew the factory load was pretty warm. It only took 3.6 mils to get to 655, so I had figured 2,950 anyway. So I started load development with that velocity in mind.

1,600 rounds and then I'll pull the barrel is kind of my goal. At this point I don't think I'll do another 6GT anytime soon. I love the efficiency of the round, but I've had feeding issues in both of my AI mags. I did try chambering a few in my 6.5x47 FN SPR...and the 10 attempts worked fine, maybe because of the CRF, or maybe I just got lucky.

I bet there's probably a good lower velocity window, but not being hugely invested in this round I'm not really concerned with barrel life. FWIW, the most this barrel sees at a time is 10 rounds...maybe 25-30 over a half-hour load development session.

 

[Malum Prohibitum]

$260 for 100 rounds, wow!

 

[diggler1833]

$260 for 100 rounds, wow!

Yeah, not cheap. I bought it when my barrel came in and there was zero Alpha brass, or Hornady loaded ammo available. I figured I'd break the barrel in and find a seating depth preference for the 105 Hybrid while I was at it. Turns out that it was a hammer of a load after a small tweak...but I'm not making a habit of paying $2.60/round for something that I shoot as a hobby.

 

[Malum Prohibitum]

What was the small tweak?

 

[diggler1833]

What was the small tweak?

.005 in, nothing else. Went from three consecutive 4+1 groups to this for three consecutive groups:

 

[Oldmauser]

I will be building my first 6gt later on this year. I plan to run 28". As far as I can see it's on the longer side. Just thinking if tuning it would be much harder than 26".

 

[4O6shootist]

28" is where you want to be. I've had 22 24 26 28 and a 30.

 

[Cascade Hemi]

I have a 28" 6GT. FWIW, almost all of the posted load data is from 26" barrels.

 

[John Glidewell]

Been playing with 115 DTACs and different powders. RL 16, RL 15.5, N555, H4350. I decided to stay with 15.5. Chamber is a standard .120 freebore. It likes .040 jump. I ran tests multiple times to ensure repeatability. This load is very consistent.

 

[drglock]

Two weeks ago the match I shot was pretty much the last of that lot of 115 DTACS. So when switching to the new lot# I figured it was time to try the new SAC bushing . No matter what powder charge or seating depth I tried I couldn’t get it to group as well at 500yds or get SD/ES as good. Though don’t get me wrong they still shot decent just not up to what I’ve come to expect with this barrel and DTACS. So I loaded up enough to foul the barrel and check zero since I’d recently cleaned it. Below are the results though I only did two 5 shot groups the results were good enough for me.

115 DTACS
H4350 35.8grs
SAC neck bushing

Exact same load as above but back to using my Redding bushing

 

[Hickswr]

Two weeks ago the match I shot was pretty much the last of that lot of 115 DTACS. So when switching to the new lot# I figured it was time to try the new SAC bushing die. No matter what powder charge or seating depth I tried I couldn’t get it to group as well at 500yds or get SD/ES as good. Though don’t get me wrong they still shot decent just not up to what I’ve come to expect with this barrel and DTACS. So I loaded up enough to foul the barrel and check zero since I’d recently cleaned it. Below are the results though I only did two 5 shot groups the results were good enough for me.

115 DTACS
H4350 35.8grs
SAC neck bushing
View attachment 8391913View attachment 8391914
Exact same load as above but back to using my Redding bushing
View attachment 8391915View attachment 8391916

No mandrel used? Just bushing die and seat bullets?

 

[drglock]

No mandrel used? Just bushing die and seat bullets?

I use a .2415 mandrel

 

[drglock]

Groups with the SAC bushing being used. Not sure if it’s runout or the flare that SAC uses being at a bad spot for my seating depth.
SD with the SAC bushing was 7.5-9.
SD with the Redding was 3-4

Groups with SAC bushing

Normal groups with the Redding bushing

 

[4O6shootist]

Groups with the SAC bushing being used. Not sure if it’s runout or the flare that SAC uses being at a bad spot for my seating depth.
SD with the SAC bushing was 7.5-9.
SD with the Redding was 3-4
View attachment 8391929View attachment 8391931
Normal groups with the Redding bushing
View attachment 8391932View attachment 8391933View attachment 8391934
View attachment 8391936

Not all dies are created equal, no matter the price. That 'spensive juice ain't always worth the squeeze.

 

[MilSpecOkie]

@drglock

It could be a slight difference in neck tension between the two dies? The sizing could be slightly different resulting in a case capacity difference. I bet slight tweaking would result in groups of equal size. If not you could go back to the other sizer and live happily ever after.

 

[drglock]

@drglock

It could be a slight difference in neck tension between the two dies? The sizing could be slightly different resulting in a case capacity difference. I bet slight tweaking would result in groups of equal size. If not you could go back to the other sizer and live happily ever after.

This was with using Redding die with the SAC universal neck bushing. Only thing I changed out was the bushings. So yes just gonna stick with the Redding bushing.

 

[MilSpecOkie]

This was with using Redding die with the SAC universal neck bushing. Only thing I changed out was the bushings. So yes just gonna stick with the Redding bushing.

Gotcha. For some reason I thought you were using their complete die.

 

[4O6shootist]

Gotcha. For some reason I thought you were using their complete die.

Same here

 

[drglock]

Gotcha. For some reason I thought you were using their complete die.

Same here

My bad I did say bushing die in the original post.

 

[4O6shootist]

My bad I did say bushing die in the original post.

Micrometer the inside edge of the two bushings, Chances are they arent the same. Even a redding TiN coated 267 bushing sizes a thou smaller than a standard stainless 267. Then compress RCBS, Forster, Hornady 267 VS the Redding and they all measure a lil different! Sometimes a thou of nk tension will make that big a difference.

 

[MilSpecOkie]

I’m pretty sure SAC has a taper to the first part of their bushing. Basically it only fully sizes about half the neck. I don’t remember who, but think Wilson does the same thing. They say flip it over if you want more of the neck sized.

 

[Cascade Hemi]

Redding bushings are often a different size than what is marked on them.

 

[Malum Prohibitum]

I use a .2415 mandrel

I assume this is the 21st Century Innovation mandrel?

 

[drglock]

I assume this is the 21st Century Innovation mandrel?

Yes

 

[762 ULTRAMAGA]

Not to get off topic with load data but what magazines are working the best with the GT?
I've talked with a number of shooters who claim they're seeing lots of feeding issues at matches

 

[Vandoogle13]

Not to get off topic with load data but what magazines are working the best with the GT?
I've talked with a number of shooters who claim they're seeing lots of feeding issues at matches

These work amazing and are very reasonably priced!

https://mdttac.com/6gt-polymer-aics-magazine-10-round/

 

[4O6shootist]

Not to get off topic with load data but what magazines are working the best with the GT?
I've talked with a number of shooters who claim they're seeing lots of feeding issues at matches

I've run arc aics mags(not in production currently) with arc, zermatt, impact, lone peaks with no issues. My first 6gt was on an impact and magpul pmags worked well after taking a dremel to the top of the lips and shortening them a bit. Tried metal mdt aics mags that didn't have a binder plate and they were problematic. Aw mags work well with my CDG action as long as you load them forward in the mag to where there case shoulder is up against the ridge in the magazine. I know there was a guy who 3d printed a spacer kit(similar to 6br spacers, but slightly shorter for longer coal) and put them in accurate aics mags and had good luck.

Magazine lip measurement 6GT

I have 4 relatively new MDT mags. Two are 10 round and two are 12 round. I shot my third PRS match last weekend and had all sorts of feeding issues. It was suggested that I needed to adjust my feed lips. I am shooting a 6GT. The gap measurements between the four magazines aren’t remotely...

www.snipershide.com

This thread has a lot of info in it.