18 or older
It is difficult to find even 10 gauge shotgun ammo today. I have my doubts if 8 gauge shotgun ammo is even made any more, but corrections welcomed.
a shotgun is pump action and a revolver "revovles" the ammo.
Standard 16 gauge shotgun shells.
Generally speaking, you have to be 18 to buy rifle or shotgun ammo, and 21 to buy handgun ammo.
N 5
6mm bb's
There is a ammo clip for a J C Higgins shotgun model 58324 16 gauge. You can buy it as a replacement part.
Try e-gunparts.com, MidWay, Brownell's
Ammo, parts, dirty
If your shotgun has Damascus barrels,then by all means do not fire modern smokeless ammo through your shotgun.I would have your shotgun looked at by a qualified gunsmith before attempting to fire any ammo through a shotgun of this age.
air soft pellets