I shoot a .410 in a .45 long colt. I have a .45 long colt derringer single shot that has no rifling in it since the barrel isn't much longer then the cartridge. I have shot .410 bird shot through it. It is effective to about 40 feet. After that you're lucky to hit anything. Makes a great noise maker and snake gun. I guess a fellow could shoot a grouse if he caught one along side the road, but there would not be much sport in that. I shot some .45 long colt out of it and it has a heck of a recoil. I have not actually shot the pistol now in a couple years. I bought it more as a "why not own it" then anything else.....