Trail Boss, start at 8 grains with a 400 grain cast bullet and work your way up till you get velocity and accurracy you are looking for. The Lyman cast bullet book has all kinds of other loads using Unique, 2400, 4759, 3031, 4227 etc. that are 1000 fps to 1800 fps for use with cast bullets.
For a shot load you are basically replacing 400 grains of bullet (just over 1/2 an ounce) with shot. Start with any 1200 fps or under loading, such as the above 8 grains trail boss, covered buy a thin card or felt wad ( you can also use many of the low speed loads in the Lyman book), add 350grains of 8 shot, cover with another card wad and add melted wax or do a light roll crimp, to seal wad. (410 card/felt wads work just fine but you can also buy 45 caliber wads at the muzzle loading supply houses. If you weigh the two card wads they usually come out at 50 grains or so. Thus, between them and the shot you have 400 grains replacing the usual single projectile.) Try different loads till you get one that pattens okay. (Play with the number and thickness of the wads, and amount of shot to get a load that just fills a case to the rim.)
One of my favorites is 11 grains of Unique, one 1/16th inch felt wad, 400 grains of #8 and a 3/16th card wad, with a roll crimp. Patterns well out of my Marlin 1895.
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