I'm thinking most squirrels will be shot at less than 30yards, likely 25. At that range, my .32 with a 10 ounce denim patch and .311" round ball, made a 5-shot group, off a bench, about the size of a
.40 calibre hole and that .40 calibre hole would cover all those shots. The load was a paltry 20gr. 3F, GOEX. That load wouldn't shoot better than 2 1/5" at 50yards though. That distance needed 15gr. more powder.