I need to fire lap a 91/30 Mosine, I'm using 314299 at .315Ø impregnated with 180 grit clover compound then with 400 grit clover. There's a rough place in the bore that leads enough after 10-12 rounds to affect accuracy.
Being winter in Okie land I will do this in my garage with a piece of tree trunk for a boolit trap.
What is the best load to use for enough volicity to just exit the muzzle I have bullseye, red dot, green dot, clays, SR4759, SR4756 unique, 2400, 4227 and maybe a couple more.