Hello: I was given a jar of LBT fire lapping compound from a friend. There were no instructions with it. He used it to fire lap a couple of .22LR guns he had. I was interested in using it on my .44 Mag Ruger Super Blackhawk. It has a little bit of a constriction in the Barrel where it is screwed into the Frame. I was wondering about what kind of bullets to use for this, Should I cast some pure lead bullets for this, and what kind of load would i use for fire lapping? I have a Lyman 429421 mould. How should I size them for this operation? I thought about buying the LBT lapping bullets but thought that they can't be anything special that I can't do myself. Any insite would be greatly appreciated. Thanks, Tom