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.
No
You can use nothing but 410 shells in a 410 shotgun.
Many fine 20 gauge shells are made.
Shotgun shells that were made in 2 5/8in length were made and chambered in 16 gauge from 1902-1927. These were found in browning shotguns of that time and others made from different manufactures. The gun making firms standardized 2 3/4in shells starting in the year 1928 in all gauges.
NO
Shells
Shot and Slug
No.
they just stop making shells for them, used as market guns to shoot large flocks of birds, for the local farmers markets. game laws probably put them down in the 1950's.