6 dasher 14 twist fire forming barrel

[CZ550]

I have a bartlien 8.5-8 gain twist that I would like to have reamed out to 6dasher. I was wondering if I could also have my 14 twist priarie dog barrel reamed at same time for fireforming ? Both barrels are very low round count cut with same no turn reamer.

I run the 58gr Vmax for prairie dogs, would that be sufficient for fireforming?

 

[gmorganal]

I have a 13.5 twist 6mm Dasher FF barrel. I've only used it once, but with the .104 freebore I had to go to an 80-grain Nosler B-Tip to reach the lands and push the case head against the bolt face. I FF'd 50 cases, and they all formed fine. And believe it or not they were stable out to 520 yards. That's as far as I shot them.

 

[alf]

I've fireformed thousands of Dashers shooting prairie dogs with a 14 twist and 55 Ballistic Tips. If the reamer has a longer freebore, just go with the false shoulder method, which I do regardless.