How do you get 150 rounds in that magazine? I can only stuff 50 (52 actually) .45ACP FMJ's in mine. Runs through them in six seconds! I have a second, smaller drum that's marked "30" holds 31. About 3.5 seconds to snarf $50 of ammo. Since I live in Chicago, handguns are illegal. Fortunately it is a two-hander.