Well a my Dads friend just gave me a load of 33g co2 cartrages that are used in life jackets and wonderd if they would be anygood for use in a 8mm ball bearing, qev airgun
chop it in half, fill the blunt tip with lead and the rest with foam and you have yourself a serious piece of ammo if you can find a barrel it fits into nicely. (oh yeah and you'd want to make sure they are empty before cutting the end off )