Most common sizes are .410 bore, 28 gauge, 20 gauge, 16 gauge, 12 gauge and 10 gauge. Note that .410 is the actual bore diameter forward of the chamber. See below for the meaning of gauge.
There have been a much wider variety of bore sizes, especially back when muzzle-loading shotguns were common, since a shotgun that does not fire fixed ammunition can essentially have a bore of any size. There have been 8 gauge guns and even larger, mostly used by commercial hunters for killing sitting birds in large numbers.
"Gauge," by the way, was originally determined by how many pure lead balls of bore diameter it took to make a pound.
Air soft shotgun shells are the size of 12 gauge shotgun shells.
It will depend on what you are hunting and which brand of shell your shotgun patterns best.
it is shotgun because the size of rifle is different than shotgun.
The letters BB indicate the size of the shot that is in the shotgun shell.This is telling you that your shot size in the shell is the same size as used in BB guns.
guage refers to the size of the shell any particular shotgun will fire.
Depends on what is marked on the gun.
That depends on the size of the shot in the 3 inch shotgun shell,and the weight of the shot.
Should use either 2 1/2" or 3" .410 shotgun shells.
2.5 inch only is my specs on mine is
The longest shotgun shell that you can safely use in your 12 gauge shotgun are 3 inchers.
Browning.com has sn data under customer service.
In a shotgun shell, it tells the number of round pellets that combine to make a linear inch.