For indoor practice or for chasing off stray dogs, take a resized case, push it into a block of parrifin wax, ensuring the case is completly full, and cut the wax off at the case mouth. Prime the case and shoot it. Due to the low pressure the primer will back out a little, and if your gun is tight fitting between the cylinder and the recoil sheild, it could even tie it up, but not so you can't open the cylinder and remove the fired cartridge. I've never bothered to chronograph these things, but at 20' they'll punch through both sides of a cardboard box. By the way, it will work with any revolver cartridge. The only down side I've ever encountered besides the extruded primers is a smokey basement and a dirty gun.