fireforming

Ive got a gun in 6mm rem that shoots half a minute with once fired brass and 3moa with new brass(win). The difference going from new to once fired while on the bench with the exact same load is truly amazing. Nothing I have done to the new brass will get it to shoot. Neck turning would do it...

I've always read that to fireform the parent case to an Ackley, you should use a small charge of fast powder, and have the bullet solidly in the lands. In the new Varmint Hunter, there is an article on Improved cartridges, and the author quotes P.O. Ackley as saying, "Fire forming should be done...