Ammunition shelf's were where the soldiers kept their ammunition and guns.
probably years. shoot it, if it fires it's good
Yes, I have seen it done. Ammo has a long shelf life but it will protect it in humid conditions.
An ammunition shelf is where all the ammo was kept in the trenches. Incase of a skirmish you just lend down and got some more.
All ammunition, if kept stored in a cool dry place, will be good for multiple decades.
A shotshell.
18
Rifle, Shotgun, Handgun, Artillery
Shotgun shells
Find someone who reloads shotgun shells. They will relieve you of your inventory.
It depends on the comparative charges of the ammunition. A rifle can have more recoil than a shotgun.
Yes, it is still sold.