Hull, primer, powder, shot, shot cup or shot wads.
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.
NO
Shells
Shot and Slug
No.
Yes, you can.
Generally "Pellets" or "Shot" contained in "Shells". There are also solid shot "Slugs" similarly contained in "Shells". I'd use Shells ie "8 shotgun shells", unless you are specifying exactly the type.
Can you....I think you mean Can you 'SAFELY' leave shotgun shells in a hot car? The short answer is yes, but it will degrade the quality of the ammo.