Thought I'd give PP a try in a 45-70. I've always shot GG's in my BPCRs. Rather than starting with a new mould, I bought some prepatched bullets from Montana Bullet works. They're from an Brooks mould (no number) , 500 gr cupped base patched up to .458. The slick is .439-.440 dia X 1.325 long. I decided that I wanted to try some bore dia. bullets so I repatched them with tracing vellum to .4505-.451. They're a slightly snug fit in the bore. I used my Lee set expansion die to just barely open the case mouth, not running the case through the die as I would with GGs. I can thumb seat them and they chamber, but the bullet fit is such that if I extract the round the bullet is pulled from the Winchester case. A Lyman taper crimp die is too big(I was warned). Do I go to thinner paper or is there a way to tighten up the case mouth. OR should I just go the shorther groove depth round and be done with it? BTW the barrel is a Wind River(Made by Green Mountain?). Brownell's used to sell them. .458 groove 1/18 twist on a TD action.
Duane