I wouldn't go below .50 caliber. For me the .54 is a more serious hunting round in a lead round ball gun. I have the mountain rifle in .58. It shoots great with 70 grains of Pyrodex. I also have the Lyman Great Plains rifle in .50 that I built from a kit. It's accurate enough to be a squirrel gun, and is the source of much amusement for the kids.
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