Not sure I understand your question. Lead is used in a lot of (but not all) shotshells. Barium, Bismuth, Copper, Tin, Carbon, Nitrogen, and Hydrogen are also found in most shot shells.
Yes.
how many shells does it hold
When were 3inch magnum
Most commercially available shotgun shells come in boxes of 25.
Air soft shotgun shells are the size of 12 gauge shotgun shells.
Find someone who reloads shotgun shells. They will relieve you of your inventory.
They are still made today. one company who manufactures them is Sellie & Bellot.
No
No
Shotgun shells are centerfire but are made up of a paper or plastic cylinder with a brass base or head. The shell is filled with powder followed by a cupped plastic wad filled with birdshot or much larger buckshot.
You can use nothing but 410 shells in a 410 shotgun.
This is a Browning Auto-5 Shotgun, 16 guage made in 1950. It is chambered for 2 3/4" 16 ga shells