I just love problems like this...

[Larryjk]

Critch, My first to grab is a S&W .41 Mag. when I am going out to have fun. My favorite playing load is a 215 grain cast bullet in R-P brass, CCI 300 primer, and 8.0 grains of SR7625. An old shotgun powder by IMR that gives 1070 (very uniform and accurate) and no leading in my revolver. For mastadon hunting I use WW brass, Win primers, 22.5 grains of H110 with a Hornady 210 grain @ 1375 fps. or WW brass, Win primers, 17 grains of 2400 with a Speer JSP 220 grain. very accurate @ 1218 fps. I love my 41.
IMR SR7625 is a little more bulky and I like to fill as much of a big case if possible. It has shown to be a very predictable powder in the .41 Mag, 44 Mag and 45 Colt with cast bullets, all running about 1050 fps and no leading in my revolvers. Don't try to achieve 1050 in a Colt revolver in 45 Colt. Use either S&W or Ruger SA.