Do I need this caliber if they are this close together?

[viking499]

Already have a 6BR. Been thinking about a 6BRA. Figured BR for under 600 and BRA for farther. But is there really that much difference between the 2?

Or do I need to go with something different than the BRA for the longer distance?

Going to stay in the 6mm/6.5mm range that is not a total barrel burner.

 

[Varminterror]

Figured BR for under 600 and BRA for farther. But is there really that much difference between the 2?

No. Either one of them is doing what the other is doing, 50fps... I might prefer the BRA over the BR, but I would not say there’s any sense in separating the two and using 6 BR for <600 then using BRA for >600. They’re the same…

 

[Dr T]

This is a realm where need is a very personal concept. On paper there doesn't seem to be enough difference to worry about, especially since the translation from paper performance to field performance will get down to exactly how the specific 6mm BRA is put together. If you have a BR with a "fast" barrel and a BRA with a slow barrel, it could be that the BR may have a higher velocity with its pet load than the BRA. Another factor is shooter confidence. If you are more confident that the BRA will shoot better at long ranges, then it might actually shoot better because in your head you think you will.

For me, it would not make any sense. But, my needs are different than yours and yours are the ones that matter.

 

[AJC1]

I understand not wanting a barrel burner and I love my 6br. If you need more go with a 6 creed or 243. Those are both common off the shelf cartridges, and are more enough to be meaningful.

 

[horsemen61]

Life is short Do Both! I want a 6 BRA personally

 

[Varminterror]

Thinking more on this thread - I have 3 Dashers now, and 3 6mm Creeds. So in your shoes, I'd probably get another 6 BR, OR, I'd change the 6 BR to a BRA, and get another BRA too. Even if I was shooting something like a 60grn Column bullet for short range in a slow twist barrel for the BR, and wanted to shoot 105 Hybrids in a fast twist for long range with the BRA, I'd default that whatever case I liked better, I'd like better for both purposes... Hence why I have 3 Dashers, instead of a Dasher, a BR, and a BRA (which would actually be easier to keep segregated than what I'm doing currently), and why I have 3x 6mm Creeds, instead of one Creed, one XC, and one GT... And equally, I have 3 and 3, instead of having 6x 6mm GT's... My match scores wouldn't know the difference - even though my barrel life WOULD know the difference - so none of them are really a wrong answer for anything I do, but I like the Dasher case, so I shoot 3x Dashers, and I like the 6 Creed case, so I shoot 3x 6 creeds too.

Neither BR or BRA will be a wrong answer, but I'm not certain there's a clear reason to not have both be the same, nor to have both be different.

 

[MarshallDodge]

I think I will always have a 6BR, and am considering a rechamber of my Dasher to a 6GT.

 

[viking499]

Forgot to add that my BR is 1:12 twist. BRA or Dasher would probably be what, 1:7 or 1:8 twist or 1:10???

I am still wavering on my stripped Tikka action. The original plan was a 26" medium weight 6.5x55 barrel, but have been thinking of a 6mm "one hole" shooter lately.

 

[MarshallDodge]

Forgot to add that my BR is 1:12 twist. BRA or Dasher would probably be what, 1:7 or 1:8 twist or 1:10???

I am still wavering on my stripped Tikka action. The original plan was a 26" medium weight 6.5x55 barrel, but have been thinking of a 6mm "one hole" shooter lately.

It depends on the bullet weight that you are going to shoot.

 

[viking499]

It depends on the bullet weight that you are going to shoot.

1:12 is currently digesting 75 grain vmax. Just not familiar with the other twists and grain combinations. Figured it would be around 90-110. 6 creed is something else i had looked at, but the current looking is in the BRish stable.

 

[MarshallDodge]

You can use these tools to get you in the ballpark-

Twist Rate Stability Calculator

Our newly updated Twist Rate Stability Calculator not only tells you what your SG is, but it also lets you know if you are reaching your optimized BC.

bergerbullets.com

JBM - Calculations - Stability

www.jbmballistics.com

 

[Varminterror]

BRA or Dasher would probably be what, 1:7 or 1:8 twist or 1:10??

Given that you're wanting to do this:

Figured BR for under 600 and BRA for farther.

Then I would go 1:7" or 1:7.5" in 26-28", and look to be shooting 105 or 109 Hybrids as a starting point.

My Dashers are 1:7.5", I've shot out to a mile with two of them, stuff gets a little squirrelly around 1400, but they get there well enough for me to say it's controllable and fun. At 600-1200, the world is mine, and shooting 300-400fps faster with my top end 6 Creed loads really don't make much difference, basically just adding ~2 tenths to the target size when I'm shooting steel.

 

[viking499]

Given that you're wanting to do this:


Then I would go 1:7" or 1:7.5" in 26-28", and look to be shooting 105 or 109 Hybrids as a starting point.

My Dashers are 1:7.5", I've shot out to a mile with two of them, stuff gets a little squirrelly around 1400, but they get there well enough for me to say it's controllable and fun. At 600-1200, the world is mine, and shooting 300-400fps faster with my top end 6 Creed loads really don't make much difference, basically just adding ~2 tenths to the target size when I'm shooting steel.

Thank you. What barrels profiles are the dashers? Shooting with or without a suppressor?

 

[Varminterror]

Thank you. What barrels profiles are the dashers? Shooting with or without a suppressor?

I have M24, MTU, and Proof Competition Contour (a little heavier than MTU) on my Dashers (26” and 27”). I have Heavy Palma and Proof Competition Contours on my 6 Creeds (15”, 24”, and 26”).

I generally shoot with brakes, but I love shooting suppressed - I shoot a few suppressor only matches each season, and shoot a couple non-required matches before them in preparation.

 

[GoldieMI]

I have both the 6BR and 6 Dasher
6BR- 1:7.5" Brux Straight Contour 28"
6 Dasher- 1:7.5" Proof Competition Contour 27"
both love the 105 Berger Hybrids with Varget/N140 loads
Dasher is suppressed, BR is not
wouldn't hesitate to grab either one for PRS matches

 

[viking499]

What's the weight limit on a 1:8 twist barrel?

 

[MarshallDodge]

What's the weight limit on a 1:8 twist barrel?

110 can be iffy. Depends on altitude and velocity.