Here in Arkansas a .40 cal can be used on small game and deer, if I understand it right. So a one gun careful hunter could live with a .40 for everything but birds and turkey. (No rifles on turkeys) I would reccommend a .32 for squirrels, its just a natural fit. Had a longrifle in .32 when I was younger and would sit at the kitchen table the night before the hunt cutting out patches with a penny for a template. Walnut and brass glowing in the corner, little round balls of lead, a can of caps, and the first good cool winds sneaking around the restless trees, and the harvest moon like a yellow lamp in the cloudy evening sky. A sipping shot of sour mash southern whiskey. Oh yeah, thats the life, and the gun to get, either flint or percussion. You'll love it. George.