gun show, gun shop
Yes, anyone over the age of 18 can purchase any ammunition for any sort of long gun, but you must be 21 yrs of age or older for the purchase of handgun ammunition such as .40 .45 9mm .357 .44 etc
Look in the yellow pages under "gunsmiths". In my opinion, the firing pins should probably remain missing on this old shotgun. It was not built for modern ammunition and may not be safe. If you intend to fire it, get a qualified gunsmith's approval and use only the proper shells.
18, the same as every other state.
You're talking about a firearm that is at least 50 and possibly 100 years old, so before you even think about shooting it, have it checked over by a competent gunsmith. Then ask him about the ammunition.
Using outdated ammunition is not safe. Corrosion on the shells as well as chemical breakdown can make them ticking timebombs. Most police departments allow you to drop off old ammunition at the department and they dispose of them properly.
Any sporting goods store should have at least a few boxes of 10 gauge shells, but probably not a large selection. You have a shotgun that is between 76 and 119 years old in 2006. Before you buy any ammunition, have the gun checked by a competent gunsmith and if he approves it he should also recommend the proper load. Even the oldest of these Winchesters should be OK with smokeless powder, but I doubt if any would stay together through a box of heavy magnum shells.
This is a Browning Auto-5 Shotgun, 16 guage made in 1950. It is chambered for 2 3/4" 16 ga shells
Buying a gun from a dealer is controlled by Federal law- 18 for a rifle or shotgun, 21 for a handgun.
18 years of age for a rifle or shotgun, same with corresponding bullets. 21 to purchase handguns and handgun ammunition.
Probably 25-30 years old. Eclipse Cartridge Co was sold in 1985.