Mike Matteson
Well-Known Member
Maybe 416 to start with? I hadn't thought of 375 die either. That would help. I have sized 300WM to 308 Norma Mag cases, and 30/06, 270 to 25/06 cases in one step. Be sure to lube, but not to heavy.Mots times when I see people do this they go in steps. .375, .338, .308, and .264 or something like this. Don't know for sure though, I have never done it