Pure accuracy…. 6br vs 6dasher vs 6GT

[Matt_3479]

Having owned and shot in both 6br and 6bra in hunting and competition I can tell you there’s little difference and all options are good choices. At the end of the day I sold the br and kept the bra due to rifle components not cartridge. Both were insanely easy, both shoot excellent, both are very consistent and accurate. When it comes to hunting the additional speed never hurt which makes me want to lean a little in favour of the larger dasher or gt. The nice thing with the br and gt is factory ammo if you aren’t a reloader or don’t want to reload all the time. The nice thing with the bra is you can run br factory ammo if needed and it’s very accurate!

Since it’s more for target then hunting I would probably lean bra or dasher. I run a 6bra for prs on an impact, ran a 6br on a deadline and run a 22bra for coyotes on a lone peak. I never experienced feeding issues with any of the calibers on any of the actions so I wouldn’t worry much about that.

 

[Lightfoote]

The Sako 90 I’ll be using runs the 6BR extremely well. With 5 in the magazine I can cycle the rifle upside down, fast, slow, on the side. They all go in the hole every time. Feeding is a non issue.

 

[AckleymanII]

The 6 BRX is a darling. Figure 150 fps over a 6 BR, and that extra speed comes in handy for hunting.

No flies on a 6 XC, and for a hunting round with 87 Bergers, 95g Ballistic tips, 105g Berger vld hunting, it is hard to beat. The 6 XC feeds in std magazines with no fuss, special mag boxes, etc.

A 105g Berger at 2950-3050 is worth building a rifle around for deer/hogs, and my long barrel shoots the 105s at 3150 with H4350 and 3250 with R#17 in Lapua Palma brass.

If you just want to punch paper, a 6 BR is the easy button, then figure the twist rate and throat configuration to match. From my experience shooting p. dogs, ground squirrels, and chucks, the 6 BR will have 5000+ rounds of very accurate barrel life with H335/AA2230 shooting 55-75g bullets, while the Dashers will start slinging shots at 1100-1400 rounds shooting H4895 with a bore that looks like a sewer pipe.

H4350 is a lot easier on throats than H4895, in my experience. For hunting, where H4350 works well, so will Win 760 and AA2700. AA2700 is one of the coolest burning powders made with an extremely long throat life.

If you shoot any of the medium cases with H4895, you will detest watching in the bore scope the throat wear and the 9" in front of the chamber bore condition! Better look before you leap! If you use a Teslong bore scope and make a video of the barrel at various intervals when shooting H4895, you will be simply amazed at how a bore is ate up for 9" over time....amazing study.

 

[S Miller]

Deer/varmints out to 500. I’d be pretty happy to shoot 10 shots into a 1” circle at 100 yards. Steel targets out to 900. Pretty sure the dasher is what I want, especially with lapua about to drop brass.

Owe geez, I live in the northeast and not even sure what a deer looks like at 500 yards. I’ve done a couple builds target/hunting, one in 6br and another in 6x47. They were fun to make but difficult to have them do both well. Good luck in what you decide. I agonize the most over adequate optic.

 

[Lightfoote]

What is the difference between BRA and BRX? Either way I don’t want to fire form.

 

[Matt_3479]

What is the difference between BRA and BRX? Either way I don’t want to fire form.

BRX is a 6br with the shoulder pushed forward .100. you can use a standard 6br die just not threaded in as far for reloading, but requires a hard jam or hydro forming to fireform brass.

BRA is a 6br with a 40 degree shoulder. The way they are chambered you can do a lighter jam or factory ammo as there is a slightly crush on close. So while technically it’s fire forming your really just running factory 6br ammo and it’s coming out 6bra. This requires its own 6bra die but they are available threw a few different manufacturers.

BRX should give you a slight edge in velocity over the bra as your gaining more internal case capacity, where the bra should give you less case growth and easier brass forming with an edge in velocity over the br

 

[Bill Norris]

Why brx, brdx, over bra or dasher?

No preference. Just mentioning these two will shoot well too.

 

[Lightfoote]

BRX is a 6br with the shoulder pushed forward .100. you can use a standard 6br die just not threaded in as far for reloading, but requires a hard jam or hydro forming to fireform brass.

BRA is a 6br with a 40 degree shoulder. The way they are chambered you can do a lighter jam or factory ammo as there is a slightly crush on close. So while technically it’s fire forming your really just running factory 6br ammo and it’s coming out 6bra. This requires its own 6bra die but they are available threw a few different manufacturers.

BRX should give you a slight edge in velocity over the bra as your gaining more internal case capacity, where the bra should give you less case growth and easier brass forming with an edge in velocity over the br

Really not seeing why do that vs just using a dasher? Cause of the dashers short neck? Alpha and now Lapua going to offer factory dasher.

 

[Matt_3479]

Really not seeing why do that vs just using a dasher? Cause of the dashers short neck? Alpha and now Lapua going to offer factory dasher.

The dashers shoot excellent as well. Some people prefer the longer neck of the br/bra over the dasher. Being able to shoot factory ammo in the bra over the dasher, and before factory brass offerings the bra definitely had a benefit when it came to forming over the dasher. Now that dasher brass is offered in multiple offerings a lot of those benefits are gone and it’s down to just the neck. Not speaking from experience here as I don’t have a dasher but the dasher is suppose to be the a little less forgiving in tuning over a br or bra, now that would be probably pretty minuscule as the dashers shoot exceptionally well

 

[AckleymanII]

6 XC has a .325 length neck, you learn to love this feature!

 

[JLT]

If you just want to punch paper, a 6 BR is the easy button, then figure the twist rate and throat configuration to match. From my experience shooting p. dogs, ground squirrels, and chucks, the 6 BR will have 5000+ rounds of very accurate barrel life with H335/AA2230 shooting 55-75g bullets, while the Dashers will start slinging shots at 1100-1400 rounds shooting H4895 with a bore that looks like a sewer pipe.

I have a Dasher barrel that still delivers match level precision, and the round count is well over 2,500. It has seen RL-16 and RL-15.5 throughout its life and the throat still looks pretty darned good. Depending on the powder and load, velocities are between 2,970 and 3,045 fps. I figure it's good for another 500 - 750 rounds before it gets pulled.

Powder choice makes a big difference. If your barrel likes AA-2700, that's a big bonus.

 

[ELR LVR]

BRX is a 6br with the shoulder pushed forward .100. you can use a standard 6br die just not threaded in as far for reloading, but requires a hard jam or hydro forming to fireform brass.

Since you say you can use the 6BR die, just not screwed down as much
...
...When chambering the 6 BRX, can a guy just run a standard 6BR chamber reamer in
another .100" deeper??
or would doing so enlarge the head area too much due to taper of the reamer?
---
Meaning can a guy just use a 6 BR reamer to make a 6BRX?

 

[Bill Norris]

Meaning can a guy just use a 6 BR reamer to make a 6BRX?

Not totally sure but I think it has to be a 6BRX reamer.

 

[Lightfoote]

I have a Dasher barrel that still delivers match level precision, and the round count is well over 2,500. It has seen RL-16 and RL-15.5 throughout its life and the throat still looks pretty darned good. Depending on the powder and load, velocities are between 2,970 and 3,045 fps. I figure it's good for another 500 - 750 rounds before it gets pulled.

Powder choice makes a big difference. If your barrel likes AA-2700, that's a big bonus.

Anything wrong with using Varget? I thought Varget and a 105 was the magic sauce for a Dasher. Obviously there is more than one way to get great results
How long is your barrel?

 

[AckleymanII]

JLT, at 1400 rounds on this dasher barrel with nothing having been shot but H4895, the throat had opened .0024. Glad to hear about the 16 and 15.5!

 

[Matt_3479]

Since you say you can use the 6BR die, just not screwed down as much
...
...When chambering the 6 BRX, can a guy just run a standard 6BR chamber reamer in
another .100" deeper??
or would doing so enlarge the head area too much due to taper of the reamer?
---
Meaning can a guy just use a 6 BR reamer to make a 6BRX?

I believe it has to be a 6brx reamer but not 100% sure on that either. Never owned one myself

 

[Bill Norris]

I believe it has to be a 6brx reamer but not 100% sure on that either. Never owned one myself

I do own one and realize I have a specific reamer print.

 

[JFrank]

Anything wrong with using Varget? I thought Varget and a 105 was the magic sauce for a Dasher. Obviously there is more than one way to get great results
How long is your barrel?

Varget shoots great in a dasher.

 

[ogre1911]

I have two versions of each of your 3 choices. They are ALL 3 top notch choices.

Easy to moderately easy to find a 1/2 moa load at 1k.

 

[ELR LVR]

Not totally sure but I think it has to be a 6BRX reamer.

Found the info, as I suspected, the taper of the reamer would enlarge the head of the chamber too much
---

" Just remember, you can't just push in a standard 6BR reamer deeper in the barrel! Don't even try it.
And because the 6BR case profile has a slight taper from top to bottom, if you just run the standard reamer in, the base of the chamber would be WAY over-sized"

Bob Crone's 6 BRX

6mmBR.com is the best guide for 6mm BR Benchrest precision shooting, complete with 6BR FAQ, Reloading Data, Shooter Message Boards, Reader Polls, and Photo Gallery. Match event calendar and rifle competition accuracy training tips. Equipment reviews (.243 bullets, 30BR cartridge, 6mm Norma...

www.6mmbr.com