Most rimmed cartridges, including those for handguns, rifles, and shotguns, negate considerably the sloppy tolerances of homemade breeches and the attendant problems of cartridge seating and head spacing. The extraction is easier, and the rim adds another zone of strength to the cartridge with a greater margin of safety to the shooter. Because a great many improvised firearms are simple muskets with smooth, large bores, like the blunderbuss of old, bullet options are varied (e.g., hunks of glass; pebbles; slugs; sinkers; nail ends; split washers; hardened candle wax, which creates nasty wounds up close; ball-bearings; split-shot sinkers; and a few other junk-pile goodies, the dirtier the better). Packing phonograph needles or headless finishing nails is a way of improvising fllchette charges in shotshells. More esoteric charges, such as aluminum paste and SillyPutty, have been used for special loads.