6MM BRA 300 yds 80Gr Bullet

[JEFFPPC]

I shot this set of UBR targets at 1800 rounds with 32.5 8208 and 80 gr bullets
I’ve been taking them off between 2000 and 2500
View attachment 1304583View attachment 1304584View attachment 1304585View attachment 1304586

Nice targets mr big. Keep that up and UBR will be counting wipeouts before you know it.

 

[dbduff]

I shot this set of UBR targets at 1800 rounds with 32.5 8208 and 80 gr bullets
I’ve been taking them off between 2000 and 2500
View attachment 1304583View attachment 1304584View attachment 1304585View attachment 1304586

Very sweet. Guess, based on what you’ve experienced, I’ve been misinformed. Thanks, this helps a lot.

 

[maddysdad]

any one shooting 68 grain bullets in 6mm bra

 

[Eric Leonard]

any one shooting 68 grain bullets in 6mm bra

Yeah the 68s will shoot in a BRA.
Worked on a 12 twist BRA Wednesday and with the 68 Avengers and H322 it came in right nicely.

 

[urbanrifleman]

I think youll be disappointed if your 8 twist was chambered for a 103+ bullet

Not really . 104 freebore is ideal for 80s.

 

[maddysdad]

i would say so.nice rifle.can you tell me the loads you would start at and describe that rifle

 

[gunsandgunsmithing]

Nice targets mr big. Keep that up and UBR will be counting wipeouts before you know it.

Old thread but, wipeouts probably will never come into play in UBR due to the different size dots. It's a lot easier to wipe out a tiny 30 cal dot than the larger 22 or 6mm dots...fwiw. It would no longer be caliber neutral.

 

[Eric Leonard]

i would say so.nice rifle.can you tell me the loads you would start at and describe that rifle

It’s a Farley action in Terry Leonard stock. 12 twist Bartlien bbl with .050 freebore and Woolums tuner. 42x NF Comp scope.
With 68s in the BRA I would start at 30 grs H322 , 29 grs LT32 or 31 grs IMR 8208 and work up from there

 

[Mark W]

For reference, here is what a Barts 80 Grain Dominator Boat Tail looks like in a zero freebore 6 BRA. I’ve shot everything from 55 Grain Varmint bullets to 80 grain boat tails in this chamber. The long neck on the BR case is very forgiving of freebore. I’m sure that some think I’m wasting powder capacity in this chamber with an 80 grain bullet, but it shoots great at 3250 fps with IMR 8208 XBR. Mine is a 12 twist barrel.

Edit: this is actually a standard BR case that was modified to find seating depth before it was fire formed. Same neck though, so that doesn’t really matter.

 

[urbanrifleman]

For reference, here is what a Barts 80 Grain Dominator Boat Tail looks like in a zero freebore 6 BRA. I’ve shot everything from 55 Grain Varmint bullets to 80 grain boat tails in this chamber. The long neck on the BR case is very forgiving of freebore. I’m sure that some think I’m wasting powder capacity in this chamber with an 80 grain bullet, but it shoots great at 3250 fps with IMR 8208 XBR. Mine is a 12 twist barrel.

Edit: this is actually a standard BR case that was modified to find seating depth before it was fire formed. Same neck though, so that doesn’t really matter.

View attachment 1412195

That is nearly into the donut.

The donut (after it forms) is not really at the "junction", it is really above it. Even with a boattail, that is too short. Especially if you jump.

Thos split necked cases tell the story. A 104 freebore would be fine. It would put the pressure ring at about 60 percent down the neck.

 

[Mark W]

That is nearly into the donut.

The donut (after it forms) is not really at the "junction", it is really above it. Even with a boattail, that is too short. Especially if you jump.

Thos split necked cases tell the story. A 104 freebore would be fine. It would put the pressure ring at about 60 percent down the neck.

I figured that I would get that from someone.

I built this rifle to shoot 55-70 grain varmint bullets which it does very well. I talked to Bart and asked him which of his bullets I should try for groups and suggested the 80 Gr Dominator Boat Tail with a slight jam. He definitely wasn’t wrong because it turned out to be the best shooting combo that I’ve tried in this rifle. The batch of brass I’m running this bullet with is on the 4th and 5th cycle with no sign of problems.

Don’t get be wrong, if I was building a rifle around 80 grain bullets, I would probably use a .50 to .060 freebore so that I would still be able to reach the lands with the light varmint bullets.

 

[urbanrifleman]

I figured that I would get that from someone.

I built this rifle to shoot 55-70 grain varmint bullets which it does very well. I talked to Bart and asked him which of his bullets I should try for groups and suggested the 80 Gr Dominator Boat Tail with a slight jam. He definitely wasn’t wrong because it turned out to be the best shooting combo that I’ve tried in this rifle. The batch of brass I’m running this bullet with is on the 4th and 5th cycle with no sign of problems.

Don’t get be wrong, if I was building a rifle around 80 grain bullets, I would probably use a .50 to .060 freebore so that I would still be able to reach the lands with the light varmint bullets.

Oh I didn't mean to criticize. Obviously it works

 

[gunsandgunsmithing]

FWIW, a 80gr fb and a 105 vld have very similar bearing surface lengths. So what works for a 105, will usually work well for the 80 fb also but you can get by with a little less. I think about .080 is ideal for them but it's just not a very critical dimension, especially with the long neck of a 6BR.

 

[RDavies]

It’s a Farley action in Terry Leonard stock. 12 twist Bartlien bbl with .050 freebore and Woolums tuner. 42x NF Comp scope.
With 68s in the BRA I would start at 30 grs H322 , 29 grs LT32 or 31 grs IMR 8208 and work up from there

Have you tried, or had any success with the 88gn FB varmint Berger?

 

[gunsandgunsmithing]

Have you tried, or had any success with the 88gn FB varmint Berger?

Berger claims it needs a faster twist than Eric's 1-12. I haven't tried them in a 12. They claim min as 1-10 and 1-9 as optimal...fwiw

 

[Clancy]

I use a .104 for pretty much everything in the BRA. Here’s a 70 grain at touch.

I say pretty much everything because I’d definitely go .035-.050 with a 68 boattail, but for most of your flat base 70s on up to 105s, it works well.

I’d be inclined to go .135 for something like the 108 elite hunter, but I try to keep the bearing surface short in the BRA, so my .104 remains the favorite.

By the way, dummy rounds are about the only use I have for this new Alpha

(Thanks for the pic, T.)