Any thoughts on 6BR or 6GT?

[JBattles]

I am picking up a new AT-XC and trying to decide if I should go 6BR or 6GT.

I already shoot 6BR with 108s and N150, but I’m wondering if moving to 6GT is worth buying new brass and dies. I should be able to still run my 108s and N150 in the GT.

Any thoughts or experience on one versus the other?

 

[4O6shootist]

6br is truly happy with all weather safe load, aka soaking wet rifle/ammo in the mid to low 2700s with 26in barrel. A 6gt will get close to 2900 in same conditions. I have a 28in 6br running 109s at 2810-2820, it not very far from pressure, but my 28in 6gt runs 115 dtacs at same speed a mile away from pressure. The gt is almost 20% more capacity.

Feeding: 6br would work in hrd kitted ax mags or a gray ops br aw mag.

My 6gt atx will run from ax mags if I can keep all the rounds slid ahead in the mag, modifying a hrd kit spacer to 0.250 will do this, or run the grayops gt mag(which is too short if you're running 170fb chamber and long ass bullets like a 112 Barnes, 110 atip/smk. The gray ops mag work for most the short freebore loads, or 115 dtacs jumping a long ways in the 170fb chamber.

I'd suggest just going Dasher, and form all your lapua 6br and be done. Dasher isn't far behind the 6gt.

6gt is a good cartridge, I've burned out a lot of them, but the br variants are so accurate and load development is minimal to none.

The advantage of gt is generally feeding very easily from lots of different mags, plus a lil velocity boost over dasher. However, you're running a proprietary rifle with its own special mags, kinda takes that factor off the table.

 

[Superjet]

I 2nd the 6 dasher recommendation

 

[giumau1]

Dasher fanboi here first of all, but, before others (rightfully) chime in, don’t overlook BRA…it’s essentially the best of both worlds in between plain BR and Dasher. All in all let’s be frank it’s a splitting hair discussion among some of the best, intrinsically accurate calibers ever produced that will contribute to build up rifles you will enjoy shooting all day long. That’s the real deal, building rifle you enjoy shooting either in comps or plinking or whatever.
Anyway you asked for a choice between a) and b) and you got suggestions towards c) and d). That's the internet, sorry.
The only pain is having a good stable provisioning line for consumables. Unless your real hobby is stockpiling shit in your basement.

 

[Kadams1563]

6GT because the option of factory ammo.

I get it your gonna reload every single round fired out of that gun but sometimes loading just sucks lol.

 

[OREGUN]

stick with what you have unless you are

A) really just looking to try something new and ready to accept…
B) changing cartridges is expensive

 

[LuvDog]

I vote 6GT since you already have a 6BR rifle

 

[giumau1]

stick with what you have unless you are

A) really just looking to try something new and ready to accept…
B) changing cartridges is expensive

Yep, changing caliber is just like divorcing. You can fuck a young(er) pussy and get rid of the old barking bitch, but there's a price tag attached to it...

 

[OREGUN]

I am picking up a new AT-XC and trying to decide if I should go 6BR or 6GT.

I already shoot 6BR with 108s and N150, but I’m wondering if moving to 6GT is worth buying new brass and dies. I should be able to still run my 108s and N150 in the GT.

Any thoughts or experience on one versus the other?

Are they selling these in 6mm now or are you having this one barreled specially for you? If you are doing a special deal, why not go away from 6mm entirely. My new answer is 25x47 or 25 CM. The XC is made for competition so let it eat.

 

[Niles Coyote]

I ran a 6GT for 4 years using 109's at 2830 and Varget/n150 around 32.5 grains in 26" barrels and just switched to 6BR this year... crazy thing was at 30 grains of Varget or N150 I was at 2830ish in this 6br 28" barrel. I've since dropped it back to 29 grains for 2740.

Biggest difference between the two. The BR is extremely easy to load for with wider powder charges shooting well. Not that the 6GT is difficult but the 6BR is a lot easier. I don't really see myself going back to 6GT. As my eyes have matured, I really enjoy the extra time 2700ish fps allows for my eyes to settle and watch the impact. Going forward I'll still be using my GT cases but they will all be 25GT and for longer or more challenging COF, 135 grain Hybrids at 2650fps are magical.

 

[FNG1001]

I ran a 6GT for 4 years using 109's at 2830 and Varget/n150 around 32.5 grains in 26" barrels and just switched to 6BR this year... crazy thing was at 30 grains of Varget or N150 I was at 2830ish in this 6br 28" barrel. I've since dropped it back to 29 grains for 2740.

Biggest difference between the two. The BR is extremely easy to load for with wider powder charges shooting well. Not that the 6GT is difficult but the 6BR is a lot easier. I don't really see myself going back to 6GT. As my eyes have matured, I really enjoy the extra time 2700ish fps allows for my eyes to settle and watch the impact. Going forward I'll still be using my GT cases but they will all be 25GT and for longer or more challenging COF, 135 grain Hybrids at 2650fps are magical.

I'm running 6BRA right now and considering going back to 6BR.

 

[Niles Coyote]

I'm running 6BRA right now and considering going back to 6BR.

I considered a BRA but my gunsmith talked me out of it. There was nothing wrong with it he just hadn't found it to really do anything that the straight BR wouldn't do already unless you are only after speed, which I wasn't, but some folks feel differently.

 

[kthomas]

I'm running 6BRA right now and considering going back to 6BR.

How come?

 

[kthomas]

I considered a BRA but my gunsmith talked me out of it. There was nothing wrong with it he just hadn't found it to really do anything that the straight BR wouldn't do already unless you are only after speed, which I wasn't, but some folks feel differently.

I would argue that it gives you more room before you reach pressure, a bit of an added safety factor and the ability to step on it a bit if you want.

 

[OREGUN]

I would argue that it gives you more room before you reach pressure, a bit of an added safety factor and the ability to step on it a bit if you want.

It also allows you some extra case to run 109-115 class bullets that are too much for the BR. It’s easy to get under-cased in a BR as you go heavier than 105, in my experience.

 

[Rob01]

I’d go GT just for the ability to use standard mags without kits. Also as mentioned you can load up or down so more versatility.

 

[JBattles]

I appreciate all the replies and ideas. Being overwhelmed with the options and choices we have in calibers, bullets, and barrels makes me feel proud to be an American!

I think I will keep it simple and grab a Bartlein 6BR barrel from Mile High and a couple BR/Dasher mags from Grey Ops and call it a day - no new dies, brass, fireforming, or different loads required.

 

[LuvDog]

My choice was 6BR and 6GT.

To me the ease of 6BR is the reason to stick with it. The downside is loading from a mag.
I don't think BRA or Dasher solve the mag problem that well, so that's why I would suggest GT.

Have both.

 

[beetroot]

What ever will run the most reliably in the AT-XC.

Can't comment about with one that'll be, but for a competition rifle 100% reliability is what I'd be looking for.

 

[DontShootEnough]

I run 6GT out of an impact 737. Factory 109 at 2,900 from a hawk hill 26. Impact tuned MDT magazine and it feeds like butta. Big fan so far.

 

[Dead Eye Dick]

My thought. I own a couple GT’s and still have a 6.5CM. I spent a bunch of time with a 7BR years ago. It shot fine but I hated it. (Did really bad things to my elbow that the 7TCU didn’t, both in centergrip XP-100’s).

If you want a sense of adventure, go with the change. 6GT or 25GT. If change is too much trouble, stay with the BR but do hope and pray that the new barrel likes the same powders/bullets/primers that your current BR likes.

Example, our son installed a new barrel on his 6GT. His former barrel shot lights out with h4350, but the new barrel wouldn’t hit the side of a barn with that powder. Now with Varget it was spot on. New barrel, not the same. If you want to keep cases separate, you’ll probably be adding new cases, boxes, and extra time processing/reloading them all separate. It happens too. When I was shooting to 6.5’s it wound up shooting two different calibers. Chambers were so different, i used two separate loading dies, different brass, primers (small instead of large) so i used different bullets, about the only thing i used in both was the powder.

So, regardless of choice, think about them being two different calibers until they prove you wrong. (And they both use the same of everything).