ok what u gotta do is go to home depot or lowes and buy a propane nozzel that screws on to a little bottle (the ones u bring camping). it costs like 10 bucks and it works. my step dad and i have a tater gun with a 3 in barrel(HUGE) ok and we shot a baseball with some cloth as a wad 275 yards EASY. the reason is because the propane head pumps air in with the propane and makes it very explosive. the large cans for grills dont work because no air is getting in. hope i was a help.