Standard 16 gauge shotgun shells.
You need to submit the kind of firearm is it? Pistol, rifle, shotgun?
6mm bb's
Personally I'd say the gun itself decides that haha, but generally speaking the 16-gauge is a good multi-purpose shotgun size, it (with the proper ammo i.e. slugs) can take down a deer no hassle.
Take it to a qualified gunsmith
Take it to a gunsmith.
9mm rounds.
How many cartridge does a 12 gauge shotgun carry.
almost every kind of 7.62x39mm
Read the owner's manual or have a gunsmith do it.
Take it to a gun smith.
You take it to a gunsmith
Lincoln's Repeater uses .44 Magnum ammo.