If you don't mind replacing the o-rings after every use, run co2 through a propane grenade. My buddy did it just to see what would happen. Blew right through the canvass on his camper 45' away and left little dents all down the side where it's metal! Oh and the test dummy standing there to be shot in the back dropped to his knees from the shot. lol! That'll give you the range but seriously don't shoot anyone up close, scare tactic only.