6 BRA to 6 Dasher ?

[Topwater]

I’m into unfamiliar territory with my new rifle. After measuring some brass that I have on hand, is is not possible to fire form 6 BRA brass out to 6 Dasher cases? I was told that it’s difficult to turn 6 BR brass into Dasher brass. I’m just wondering if the transition is easier using the 6 BRA . Thanks for your input.

 

[HTSmith]

I have no experience with a 6BRA, but "used" brass doesn't work too well to blow out. Maybe if you annealed it? I don't consider blowing dasher out from 6BR all that difficult, but I do get better results using the "false shoulder" method and that is extra steps. Have you considered buying Peterson or Alpha 6Dasher brass ready to go?

 

[Topwater]

Thanks, HT. I actually do have a couple hundred Alpha 6Dasher brass on order. I already have 200 virgin Lapua that I had hydro formed to 6 BRA. That rifle build never got made. I’m trying to decide weather to fireform them or just sell them.

 

[Ray123]

Thanks, HT. I actually do have a couple hundred Alpha 6Dasher brass on order. I already have 200 virgin Lapua that I had hydro formed to 6 BRA. That rifle build never got made. I’m trying to decide weather to fireform them or just sell them.

I shoot the 6 dasher with Alpha brass ...and never messed with fireforming Lapua. Alpha has been good, and takes the high pressure loads I put through it and primer pockets are still tight. Go with Remington 7 1/2 primers as the Alpha brass has tight primer pockets to begin with, and the Remington primers are slightly tapered on the front edge rather than square across the diameter, like CCI. I prefer RL 15 over varget but it's good. For outstanding velocity 2000MR or better yet 6.5 Staball will run 107 MK to 3132 fps or 110 SMK 3085 fps or 115 DTAC 3020 fps.
in a 28" barrel.
I tried every 105 to 115 grain bullet I could find. Shot 13 5 shot groups that averaged .313" with the 2 powders and various heavy 6 mm bullets. My barrel likes Berger 108s a bunch with RL 15 so
I ordered several thousand. Use a 6mm Wilson mandrel die on your new Alpha brass before loading. Then load and shoot no fire forming, will take "the zippy" loads on the first firing as you work up... enjoy the 6 dasher with Alpha brass, zero hassles excellent accuracy and velocity with a variety of combinations in components...from 55 & 58 gr varmint bullets over 4000 fps to 115 gr target bullets.

 

[dgeesaman]

There are two ways to get there: expand the necks to 6.5, then size the neck back down to 6 with the dasher die to create a false shoulder (better) or just load a bullet long with good neck tension and let the jam hold the case back against the bolt. I don’t see how it would be any harder than going from 6BR brass, which shooters do regularly.