thanks, all. looks like i need to find cheap, threaded 12g cartridges. somewhere other than walmart. i think it's against a local law to shop there.
italuminium, "the most common dangers from nitrous are due to ... the silliness." oh, god, no, not the silliness! the horror.
my mother also puts ice in her glass of box red wine that she keeps in the fridge. it's cute. horrible, but cute.