If you stumble across some Hornady .310 or .315" round balls, grab a box. I drip a little Lee liquid alox lube on them in a butter tub, and load 3 grs Unique (Red Dot is probably better), and they make about as much noise as a std vel 22 LR. They slay grouse and bunnies quite well, and I took an impressive bull mouse with one once in the yard as it was raiding my birdseed.