I purchased a single cavity Ideal 280468 mould thinking it might work for paper patching in a 7x57 Mauser. I assumed it was designed for the .270 Winchester's .277" groove diameter but after casting a hundred or so boolits yesterday I miked a few and found the as cast diameter to be running .282" - .283" .
I used an alloy of range scrap with about 20% wheel weights added ( by volume) and water dropped the boolits so they may be tough to size down to near land diameter for the Mauser. Anyone suggest a good mould for P.P.ing for the 7mm's?