Good morning
Another 41 mag hunter. We like the 240-265 grain range of slugs just because we like heavy for caliber in whatever we shoot. With those 900-950 fps is all we need for complete penetration from all angles we have shot. Never recovered a slug.
We also use the slowest burn rate powder that accurately gets us to velocity. So 2400 and slower powders is where we settle. 1680 is the slowest we get. We use a Dan Wesson or Rugers. Never took the 57's out hunting for corn crunchers.
50-50 plus some tin is also our mix. Range scrap and WW are free if you look around. The tin we may add 1%. Just enough to get good fill out in the old. Take a slug that was cast two weeks old and smack the nose with a 3 pound hammer. pretty good test to know what it will do on bone.
Mike in LLama Land