6BRA Fire-forming

[KenOath]

Well I finally received my reamer from JGS a couple of weeks ago and my local gunsmith was good enough to have it chambered within the week.
First time out fire forming at 100m with 29.8gns of Varget, 105vld huntings jumped .010", CCI450s, Kreiger 8tw, HV finished at 28"..
The group in between the two black squares was the first 10 shots out of the gun with the usual shoot clean regime for break in, the group to the far right is a 15 shot group, the rest are 5 shot groups, very pleased with the results so far. Just need some good weather now to start load testing, I have other bullets and powder to try but for now will stick with Varget and VLD huntings.

 

[Capt. Oblivious]

Load development should take you about 15min with that rifle. Nice shooting

 

[Clancy]

It seems like every one of these things will shoot like that. I guess I've gotta have one.

 

[comagutsa]

looks crap mate haha ..less than 6 weeks and counting and my turn

 

[KenOath]

looks crap mate haha ..less than 6 weeks and counting and my turn

Sorry mate I've misplaced my reamer...

 

[X-Caveman]

From what I've seen in 3 local barrels, short range fireforming accuracy has been nothing short of astonishing. Now, if I could actually tune a full power medium range load to match the FF, I'd have something.

 

[Alex Wheeler]

Standard for the BRA. I dont know what makes one cartridge shoot better than another while fireforming, but I have to say the BRA is the king of fireform accuracy LOL.

 

[comagutsa]

Standard for the BRA. I dont know what makes one cartridge shoot better than another while fireforming, but I have to say the BRA is the king of fireform accuracy LOL.

whats it like at 500m while FF ?? guess i will find out soon enough .. looking at using 30gr of 2208/varget and 105gr hybrids

 

[Raythemanroe]

I formed at the same spot over a couple days/week.. 50 rnds through a inch ragged hole.. Random bullets/powder just to waste, if I had it to do over again I would just shot a match with them.. Time was too short..


Rsy

 

[KenOath]

Standard for the BRA. I dont know what makes one cartridge shoot better than another while fireforming, but I have to say the BRA is the king of fireform accuracy LOL.

From what I've seen in 3 local barrels, short range fireforming accuracy has been nothing short of astonishing. Now, if I could actually tune a full power medium range load to match the FF, I'd have something.

My ff results certainly haven't hurt my confidence any..Hopefully I can find a node and stay in it over the long haul.. time will tell.

 

[KenOath]

whats it like at 500m while FF ?? guess i will find out soon enough .. looking at using 30gr of 2208/varget and 105gr hybrids

I formed at the same spot over a couple days/week.. 50 rnds through a inch ragged hole.. Random bullets/powder just to waste, if I had it to do over again I would just shot a match with them.. Time was too short..


Rsy

Yep I'll be ff at a match the end of this month at 400m after the way it ff at 100..

 

[Alex Wheeler]

I had a customer holding .5 moa at 600yds fireforming. 10 shot groups.

 

[X-Caveman]

I'm shooting a 200yd match this weekend with a 12 twist fireforming. 30.5gr XBR8208 pushing 80gr Berger Varmint flat base. The ultimate in lazy man wildcatting. Absolutely zero load work, traded @P1ZombieKiller some targets for turned brass. Chargemaster the powder, load a pill about .01" into the lands and shoot. I took 20 rounds to the range last Sunday to start breaking in the barrel. After shooting 10, I stopped. They shot as well or better than anything else I've shot at 100. I figured I might as well shoot the match with them.

 

[500Stroker]

Well I finally received my reamer from JGS a couple of weeks ago and my local gunsmith was good enough to have it chambered within the week.
First time out fire forming at 100m with 29.8gns of Varget, 105vld huntings jumped .010", CCI450s, Kreiger 8tw, HV finished at 28"..
The group in between the two black squares was the first 10 shots out of the gun with the usual shoot clean regime for break in, the group to the far right is a 15 shot group, the rest are 5 shot groups, very pleased with the results so far. Just need some good weather now to start load testing, I have other bullets and powder to try but for now will stick with Varget and VLD huntings.

Just curious, you jumped the bullets .010? Most shooters I know, included myself jam the bullet for fire forming. Why the jump?

 

[Gabe22BR]

I jump mine .018 , that's where it likes it.

 

[KenOath]

Just curious, you jumped the bullets .010? Most shooters I know, included myself jam the bullet for fire forming. Why the jump?

It was recommended to me to set the 6BRA chamber up with a slight crush fit, so use a standard BR go gauge as a no go gauge. I used a standard BR load that worked with the VLD Hunting's in my straight BR to fire form in the BRA. So far the 50+ pieces of brass I've ff have come out very uniform. That's about as much as I can tell you, my smith was confident it would work without jamming.. @ Alex Wheeler could probably explain the process in more detail than I can..

Cheers Rushty

 

[Alex Wheeler]

You dont have to jam bullets, create false shoulders or any other fireforming procedure with the bra. The virgin 6br case is a snug fit in the bra chamber.

 

[trevort]

you are getting me excited. Teaser pic from my smith by text tonight

 

[akajiggs]

what seems to be the best fb and neck for the 105 class bullets,without getting to radical with neck turning?
Thanks
Jim

 

[ARshuter]

You dont have to jam bullets, create false shoulders or any other fireforming procedure with the bra. The virgin 6br case is a snug fit in the bra chamber.

So you use a standard 6mm BR go gauge to headspace when chambering? Thanks