A friend of mine has an old Browning shotgun. "Sweet 16" it's called. He got it from his grandfather, who went out and bought a whole case of ammo for it back when he bought the gun. This is paper cartridge ammo, and is probably 50 years old. He's never had a misfire, ever.
I used to have an old Sharps falling block rifle. The kind Custer's men used back in the day. Heavy as hell, but it could knock down a bear at 150 yards. The ammo I had for it was antique, some of it pretty corroded. I used metal cleaner/polish on it so it wouldn't jam in the breech, and it still fired. Wish I'd kept that one, might be worth something now days.
If kept dry, almost all ammo will last indefinitely.
I used to have an old Sharps falling block rifle. The kind Custer's men used back in the day. Heavy as hell, but it could knock down a bear at 150 yards. The ammo I had for it was antique, some of it pretty corroded. I used metal cleaner/polish on it so it wouldn't jam in the breech, and it still fired. Wish I'd kept that one, might be worth something now days.
If kept dry, almost all ammo will last indefinitely.
Full of ideas, but slow to produce parts