6gt

[zandnubbz]

My go-to load on this has been 34.1 grains of Varget and 105 hybrids at 0.065" off... CCI450s

Details:

Impact SA RH​

Foundation stock​

Bartlein M24 at 25" and 1-7.5 twist​

230 rounds down the tube now - Alpha brass​

​

Odd chargers from the data file below.... total of 10 shots...

 

[Roksliding]

26” Bartlein 1:7.7

107smk
Alpha brass
Cci450
.050 (ish) off
Varget 33.2 for 2880
or
Varget 32.6 for 2815ish both are solid.

(I currently don’t trust my labradar, and haven’t trued these yet, so these speeds maybe slow by 30fps)

 

[rmfield]

FYI QuickLoad users: Neco finally has June update available and it includes 6GT cartridge data per Renee Deeter at Neco.

 

[Sinful Silence]

Hello All . im researching my first bolt action build . Decided on the 6gt but barrel length and profile I can’t decide on . I want to use my thunder beast silencer so I was thinking a 24’’ barrel should work well or should I just go with a 26’’? I do want to start shooting match’s and don’t know much about the weight of the rig off of barriers and bags but I was thinking heavy Palma or m24 profile . sorry for the noob questions but bolt action completely new to me

 

[Sinful Silence]

Thanks reubenski that’s what I was looking for a little confirmation . This threads been pretty good with info and loads to help get started .I read that about the .237 bore and that’s what I was looking at in a bartlein or a krieger was leaning toward the krieger just always wanted one .Altus has the defiance deviant action barrel combo in 6gt with heavy Palma profile instock .i Might just go ahead a get that saves the trouble of getting a blank and having it spun up . my first piece of the puzzle should be here this week a manner prs-tcs stock . Really excited to start this build it’s been a long time coming and saving

 

[Sinful Silence]

Thanks for that info . didn’t realize the deviant couldn’t take prefits . Definitely was going with the nitrated version . The ruckus and deviant was the choices I liked from defiance and the other one I liked was the bighorn tlr3 . i Really like that you can swop the bolt head of the tlr3 but I’m not sure it would get enough use to be worth it .

 

[Vandoogle13]

Thanks for that info . didn’t realize the deviant couldn’t take prefits . Definitely was going with the nitrated version . The ruckus and deviant was the choices I liked from defiance and the other one I liked was the bighorn tlr3 . i Really like that you can swop the bolt head of the tlr3 but I’m not sure it would get enough use to be worth it .

Another option worth looking into is the Impact 737r, Altus has them in stock and will do a barreled action deal.

Impact Precision 737R Barreled Action

Altus Shooting is your one-stop destination for precision rifle or shooting accessories, shooting competitions and course offerings.

www.altusshooting.com

 

[Kadams1563]

Impact over defiance for sure. My defiance was slick as it was nitrided and it fed so smooth sometimes I would have to check if it picked a round up out of the magazine. BUT I like the speed and the bolt throw in the impact better. Sold the defiance.

 

[Sinful Silence]

Didn’t look at the impact much ……but I’m looking real hard now . It looks similar to the defiance but people seem to like them better . At least that’s what I’ve found in my quick research on the internet . im Really glad I started asking you guys for your opinions .

 

[Niles Coyote]

Didn’t look at the impact much ……but I’m looking real hard now . It looks similar to the defiance but people seem to like them better . At least that’s what I’ve found in my quick research on the internet . im Really glad I started asking you guys for your opinions .

I have been running an impact action for the last three years, actively compete in PRS comps both pro and regional. I love the action and have had zero complaints or failures with it... Tate Streater makes a great product, supports our sport, actively competes, match directs and is just a great guy! He is the T in JTAC if your ever looking for some training too.

This year I tried running a Thunder Beast dominus and used a 24" barrel rather than the 26" inch barrels I had been using. Once you consider the length of the brake and the barrel length's I think my 24" with the dominus was maybe a inch longer over all than the 26" had been with a brake. It definitely wasn't holding me back in my movement through stages. My velocity loss between the two lengths using the same load was only around 30fps.

Ultimately I decided to go back to the muzzle brake because I was having a hard time adjusting to the recoils extended push while trying to spot my impacts on targets. That said, the combo was awesome and fun to shoot. I'd like to try a Area 419 maverick in its short configuration with the brake on the end, that might be my holy grail...

If you decide to go with the prefit option, I have had great experiences with Nick over at Straight Jacket Armory. Follow Straight Jacket Armory over on Facebook. Last I knew he was running a special on prefits and he offers a few different barreled actions that are prefit compatible, including Impact Precision.

 

[DeathBeforeDismount]

Another 6GT GAP in a Foundation Stock. First time out with it

Bore sighted, 5 Rounds into some shooter's leftover target still down range. Splatter target even, not good for acquiring a precise bull.

9 shots left to test Velocity....

View attachment 7889582



View attachment 7889583

View attachment 7889584

GAP 737R Foundation 6MM GT

107 SMK, 34.5 grains of H4350
New GAP/Hornady brass, old cci 400

Series,18, Shots:,9
Min,2688, Max,2707
Avg,2695 ,S-D, 6.6
ES , 19

Series,Shot,Speed
18, 1, 2689, ft/s
18, 2, 2692, ft/s
18, 3, 2696, ft/s
18, 4, 2692, ft/s
18, 5, 2688, ft/s
18, 6, 2705, ft/s
18, 7, 2695, ft/s
18, 8, 2707, ft/s
18, 9, 2693, ft/s
----,----,----,----

Add 2 grains of powder and watch your SD's go down.

 

[DeathBeforeDismount]

Except of course when you're in a velocity node when several tenths will make no difference at all which is what I was trying to get at in my last post.

Velocity node? How cute.

 

[DeathBeforeDismount]

Didn’t look at the impact much ……but I’m looking real hard now . It looks similar to the defiance but people seem to like them better . At least that’s what I’ve found in my quick research on the internet . im Really glad I started asking you guys for your opinions .

Impact is a superior action IMO. You may be splitting hairs, but there is a reason about half of PRS shooters nationwide run an impact. Its an updated surgeon which was the golden standard of actions for over 10 years.

They just keep running in really bad conditions. Bartlien barrels are always in stock and can be had in days. Bolts, stocks , basically everything you could need to build a rifle, they sell direct and no sales tax. If you are military/LE, even better.

I do not think there is a better off the shelf action than an Impact when you take everything into consideration. Quality, Reliability, Availability.

 

[Sinful Silence]

Thanks guys . niles I’m glad to hear the 24’’ barrel didn’t hold you back and didn’t lose enough velocity to make that length a dud . i definitely shoot better with a silencer but 99% of this has been behind a gas gun .

 

[BuLLet]

I loaded up 500 rounds of New Hornady brass, kept it low to start... I'll work it up some when this batch of 500 is done.

Add 2 grains of powder and watch your SD's go down.

 

[BuLLet]

Did a little velocity testing on this BAT TR 6MM GT today. Sand Pit 200 Yards, 88 Degrees and Soupy Humid.

10 shots.

BAT TR MCS PRS1 6MM GT

107 SMK, 34.5 grains of H4350
New GAP/Hornady brass, old cci 400

Series,19, Shots:,10
Min,2695, Max,2718
Avg,2707 ,S-D, 9.0
ES , 23

Series,Shot,Speed
19, 1, 2695, ft/s
19, 2, 2696, ft/s
19, 3, 2716, ft/s
19, 4, 2718, ft/s
19, 5, 2711, ft/s
19, 6, 2718, ft/s
19, 7, 2703, ft/s
19, 8, 2697, ft/s
19, 9, 2711, ft/s
19,10, 2708, ft/s
----,----,----,----

 

[John Glidewell]

5 at 100. 107 SMK @ 2950. 33.4 of RL 15.5 jumping .035 off lands in OCD brass. Bobcat at 750. First shot was .1 low follwed by 3 in 8mph wind from 230. My new match load

 

[Buck Lawman]

Velocity node? How cute.

OMG!!! Thank you so much!

 

[Buck Lawman]

Maybe you can help me out. I keep getting these weird fliers? Same load different days. Both 5 shot groups shot next to the labradar 10 shots total = MV 2881 SD 4.9. Rifle in the foreground.
TL3
Proof 6GT prefit 26 inch
Alpha brass
Federal 205M
33.4 grains of Varget
Berger 109’s

 

[Turbwhistle]

Looking for some input. I been running my 6 gt loaded up with 36gr of h4350, alpha brass, br4 primers, with a berger 109lrht. I have been getting a velocity of 2868, and at my match today i was experiencing some hard bolt lift. I am running 3 thou of neck tension on annealed brass, seated 1.935 cbto, which is .065 of lands. I bump my shoulders 3thou. It was also 100degrees at the match today.

So does any of this sound off and would cause a hard bolt lift on a defiance action? Primers look very good, i do get a slight amount of ejector swiping.

 

[John Glidewell]

Last time you cleaned? Carbon ring starting to form? Was your ammo left out in sun or did you shade it?

 

[Turbwhistle]

Last time you cleaned? Carbon ring starting to form? Was your ammo left out in sun or did you shade it?

Could possibly be dirty guess i’ll clean this thing.

And ammo was in my pack not in direct sunlight.

 

[BuLLet]

Shot this GAP PPR again today. 34.5 grains of h4350 and 107 smk. 10 to 15 mph sustained with 25 gusts.

Re-mounted scope, 2 into 200 yard back stop, then 3 shot group on paper.

Rifle and round is rocking...

Even with some wind fliers it's good, or perhaps me flyers...

 

[Jefe's Dope]

Looking for some input. I been running my 6 gt loaded up with 36gr of h4350, alpha brass, br4 primers, with a berger 109lrht. I have been getting a velocity of 2868, and at my match today i was experiencing some hard bolt lift. I am running 3 thou of neck tension on annealed brass, seated 1.935 cbto, which is .065 of lands. I bump my shoulders 3thou. It was also 100degrees at the match today.

So does any of this sound off and would cause a hard bolt lift on a defiance action? Primers look very good, i do get a slight amount of ejector swiping.

I run nearly an identical load except I use CCI 450s and get about 30 fps faster. No heavy bolt lift and it shoots extremely well. As long as my ballistic app is set up properly.*

*Was shooting a match today but everything beyond 500 yards was falling way short. Turns out I did "something" to my Strelok Pro app and was getting about 1-1.5 MILS short of actual dope. i.e Strelok was telling me 7.7 mils for 1141 when I needed 9.2. Only figured out the issue when I compared notes from the same match in June. But that's another subject altogether. I'm just happy I it was the app and not the tracking on my scope.

 

[4O6shootist]

Looking for some input. I been running my 6 gt loaded up with 36gr of h4350, alpha brass, br4 primers, with a berger 109lrht. I have been getting a velocity of 2868, and at my match today i was experiencing some hard bolt lift. I am running 3 thou of neck tension on annealed brass, seated 1.935 cbto, which is .065 of lands. I bump my shoulders 3thou. It was also 100degrees at the match today.

So does any of this sound off and would cause a hard bolt lift on a defiance action? Primers look very good, i do get a slight amount of ejector swiping.

Man I run 36.2gr h4350 with same bullet from a 28" barrel at 2910-2920 cci450. Its an extremely mild load, i can get near 3080fps before bolt lift on an ARC nucleus gen2. How many firings? Check the diameter of a sized case at the web area vs a fired. Perhaps the web isn't getting sized enough by your dies? 3k bump is a bit more than necessary, I usually strip my bolt down and size a case just enough to get the the bolt handle to falls shut on its own weight, and go one more thou, usually works out to 0015 or 002 from fired.

 

[John Glidewell]

Man I run 36.2gr h4350 with same bullet from a 28" barrel at 2910-2920 cci450. Its an extremely mild load, i can get near 3080fps before bolt lift on an ARC nucleus gen2. How many firings? Check the diameter of a sized case at the web area vs a fired. Perhaps the web isn't getting sized enough by your dies? 3k bump is a bit more than necessary, I usually strip my bolt down and size a case just enough to get the the bolt handle to falls shut on its own weight, and go one more thou, usually works out to 0015 or 002 from fired.

This would be #2 for me. If carbon is not an issue it is most likely this. Great post.

 

[4O6shootist]

This would be #2 for me. If carbon is not an issue it is most likely this. Great post.

Thanks man! Another thing...... @Turbwhistle do you know the barrels bore diameter? My first 6gt was a 236 bore diameter Krieger. It shot lights out with 108bt bergers at 2950 till about 800 rounds. Then it went way wonky psi all over the place. The 236 vs 237 bore will bring up psi by quite a bit fouling only makes it worse. I cleaned the living hell out of that thing, abrasives, bronze brush on a drill to clean any and all copper/carbon from neck and leade. It was spotless yet never could get back to the prior speed without ejector and bolt lift, my belief ot developed enough roughness and fire cracking it waa just grabbing the bullet more at this point and it was there to stay. My primers were flat though, obvious over psi signs, but Horandy brass was being used on that barrel. Lesson learned, dont get a tight bore barrel in 22 or 6mm caliber blanks. It'll only cause problems.

 

[John Glidewell]

Thanks man! Another thing...... @Turbwhistle do you know the barrels bore diameter? My first 6gt was a 236 bore diameter Krieger. It shot lights out with 108bt bergers at 2950 till about 800 rounds. Then it went way wonky psi all over the place. The 236 vs 237 bore will bring up psi by quite a bit fouling only makes it worse. I cleaned the living hell out of that thing, abrasives, bronze brush on a drill to clean any and all copper/carbon from neck and leade. It was spotless yet never could get back to the prior speed without ejector and bolt lift, my belief ot developed enough roughness and fire cracking it waa just grabbing the bullet more at this point and it was there to stay. My primers were flat though, obvious over psi signs, but Horandy brass was being used on that barrel. Lesson learned, dont get a tight bore barrel in 22 or 6mm caliber blanks. It'll only cause problems.

#3. Not knowing round count. Why I asked about carbon first. But I am on barrel #4 and the first one I had was tight. Same thing around 600. Tried everything. Was toast around 850. Barrel smith cut it open, said it looked like 3k plus. I was running 32 something of N150. I have moved on to RL15.5. Over 1k on these 2. Should get 2400ish to 3k on them, so says the barrel life calculator. It is funny how the GT seems to be a bit more finicky with carbon and pressure.

 

[4O6shootist]

#3. Not knowing round count. Why I asked about carbon first. But I am on barrel #4 and the first one I had was tight. Same thing around 600. Tried everything. Was toast around 850. Barrel smith cut it open, said it looked like 3k plus. I was running 32 something of N150. I have moved on to RL15.5. Over 1k on these 2. Should get 2400ish to 3k on them, so says the barrel life calculator. It is funny how the GT seems to be a bit more finicky with carbon and pressure.

Agreed, they're a bit more temperamental than a br variant, however still better than a 6cm for staying in tune. My 28" 7.5tw mod400 bartlein has 1900 rounds on it. The throat has moved near 60k since new. Original load development was 40k jump with 109s, its now jumping around 100k, I have not adjusted as it still shoots half moa or better on paper at 500y. I have added 0.2gr powder to keep the velocity at 2920 or so with the throat erosion. I really expected the harder bartlein alloy to hold in longer than that, but fire cracking isn't too bad, I think it'll go 3k rounds. I should probably retune the load, however I now have about 210 freebore as it was cut 150 to start. Might just switch to dtacs since I have plenty of room for them now.

 

[BuLLet]

I'm through my first lot of 500 GAP Hornady brass, are these codes still valid for Anealing Made Perfect:

"Aztec mode use 142 for Hornady, 141 for Alpha"

Going to anneal this lot of brass for the first time, I'd rather not waste a case if these numbers are valid.

Also, loading up SMK 107's with H4350, my first loading was 34.5 grains, getting on average a bit over 2700 fps and good accuracy. What grains have shown good results and no over pressure signs with this combo?

Thanks

 

[4O6shootist]

I'm through my first lot of 500 GAP Hornady brass, are these codes still valid for Anealing Made Perfect:

"Aztec mode use 142 for Hornady, 141 for Alpha"

Going to anneal this lot of brass for the first time, I'd rather not waste a case if these numbers are valid.

Also, loading up SMK 107's with H4350, my first loading was 34.5 grains, getting on average a bit over 2700 fps and good accuracy. What grains have shown good results and no over pressure signs with this combo?

Thanks

140,141,142 wont make much a difference. You're worried about losing a case? Don't go shoot any matches, you'll lose at least a few every time.

 

[Jefe's Dope]

Mine came back at 145 when testing one in the AMP.

 

[BuLLet]

Mine came back at 145 when testing one in the AMP.

Thanks

 

[dimar1492]

Just tested 6 pieces, 145×4 and 146×2

 

[Jefe's Dope]

Just tested 6 pieces, 145×4 and 146×2

Which setting are you going with? IIRC AMP recommends 145.

 

[dimar1492]

Which setting are you going with? IIRC AMP recommends 145.

I settled on 145 for now

 

[MDof2]

They are linear numbers so I'd be surprised if one guy can outshoot a 142 over a 145 annealing.

 

[DLS]

My GT won’t be ready for another few weeks but have gathered up powder/bullets/ dies all I need is brass. Is there a general consensus on wether OCD is .50 cents apiece better than Hornady?

 

[4O6shootist]

My GT won’t be ready for another few weeks but have gathered up powder/bullets/ dies all I need is brass. Is there a general consensus on wether OCD is .50 cents apiece better than Hornady?

It definitely is in my opinion.

 

[MDof2]

My GT won’t be ready for another few weeks but have gathered up powder/bullets/ dies all I need is brass. Is there a general consensus on wether OCD is .50 cents apiece better than Hornady?

I can't say if it's worth it in the sense that I haven't bought both and tried / compared side by side for 2500 rounds and have some metrics that say one is better than the other.
I can say from buying Alpha OCD brass the first time, I'd do it again the same way.

 

[Jefe's Dope]

My GT won’t be ready for another few weeks but have gathered up powder/bullets/ dies all I need is brass. Is there a general consensus on wether OCD is .50 cents apiece better than Hornady?

Yes.

 

[Eurodriver]

Hornady 109 factory ammo is getting me top 10 finishes and production wins. I love not having to deal with sitting at the reloading bench. The amount of time saved is incredible. I don’t even need to pick up my brass anymore on stages.

I know this is a reloading thread but I thought it may be valuable to anyone who is on the fence and feels like they need to reload.

This stuff rocks.

9.3 SD were the first 5 rounds out of the rifle.
The other image was round 175-179 after the final PRS stage for the day.

 

[rmfield]

Alpha vs Hdy: Depends on how you define "better". My GT shoots under 1/2 MOA all day long with new Hornady brass. I run 34.4 gr of Varget behind 109 LRHTs and the cases handle the pressure just fine - even on really hot days. For me, the only way Alpha brass would be 50% better is it gave me 50% more loadings. I'm a ways off from finding out how many I can get out of the Hornady brass.

 

[dimar1492]

Hornady 109 factory ammo is getting me top 10 finishes and production wins. I love not having to deal with sitting at the reloading bench. The amount of time saved is incredible. I don’t even need to pick up my brass anymore on stages.

I know this is a reloading thread but I thought it may be valuable to anyone who is on the fence and feels like they need to reload.

This stuff rocks.

9.3 SD were the first 5 rounds out of the rifle.
The other image was round 175-179 after the final PRS stage for the day.

What kind of barrel and how long?

 

[Eurodriver]

What kind of barrel and how long?

It’s an MPA PMR BA. 26”

 

[CK1.0]

Anyone use a 6CM seating die with 6GT..?

I’m getting my shit together for my next barrel (going from 6CM to 6GT, for no other reason than I’m switching to SRP’s from LRP’s, so why not) and can’t really think of any reason why a 6CM die wouldn’t be fine?

FWIW, it’s a Forster Ultra Micrometer Seater…

 

[dimar1492]

Anyone use a 6CM seating die with 6GT..?

I’m getting my shit together for my next barrel (going from 6CM to 6GT, for no other reason than I’m switching to SRP’s from LRP’s, so why not) and can’t really think of any reason why a 6CM die wouldn’t be fine?

FWIW, it’s a Forster Ultra Micrometer Seater…

They make 6 Creed brass with small rifle primers

 

[CK1.0]

They make 6 Creed brass with small rifle primers

I know, but since I was buying hundreds of dollars of new brass, figured I’d make the switch…

GAP/Alpha’s “Gay Tiger” headstamp pushed me over the edge lol

 

[357Max]

Anyone use a 6CM seating die with 6GT..?

I’m getting my shit together for my next barrel (going from 6CM to 6GT, for no other reason than I’m switching to SRP’s from LRP’s, so why not) and can’t really think of any reason why a 6CM die wouldn’t be fine?

FWIW, it’s a Forster Ultra Micrometer Seater…

Don’t know about the Forester? It might not adjust short enough.

FWIW - I’m using the SAC seating die for 308, 6.5C, 25C, 6GT, 6.8SPC, 224V, & 6ARC. I made a couple step down sleeves for SPC & Grendel sized cases. Works great.

I compared the SAC seater to my Widdon seater for the 6GT and saw no discernible difference in run out.

 

[CK1.0]

FWIW/FYI, I emailed Forster about using their 6CM Ultra Mic seating die for 6GT and their Technical Support got back to me...

Holy shit! An actual thoughtful response! Good on them, and good to know they don't just "mail it in" like so many companies do:

"Our seating die chamber is oversized by .004-.005", so you shouldn't have an issue with the diameters. The seating die chamber is designed to have the case supported on the shoulder within the die. This means that the 6GT case would not touch the shoulder portion of the 6CM die chamber due to the body length difference which can potentially throw run out in your operation. This could be remedied by shortening the die chamber by ~.180".

All that said, yes, you could certainly make this work. I do also want to let you know we're adding the 6GT sizing and seating dies to our lineup. You could expect these to become available in the next month or two.

Regards,"

I have already ordered the custom Hornady set from GAP because I actually like the idea of a custom-honed .266 FL die (not to mention I like having a back-up set of dies for "just in case" anyway), but I'll probably snag one of the Forster's when they're available, I really like their seater.

I'll gut the FL die of any expander nonsense and will follow it with a .241 mandrel. If the Hornady doesn't work out, I'll pick up a Wilson bushing die (which is what I've been using in 6CM for my last 3 barrels).