Most hold ammo in tube under the barrel. Make sure firearm is empty then unscrew the end cap on tube/magazine. Plug should be there.
As many as you can fit- but you cannot hunt with a gun that will hold more than 3.
Anywhere from 1 to 20 or more depending on action type, feeding system, type of shell and gauge.
When hunting, most states will require that a shotgun not be able to hold more than 3 shells- the plug blocks the magazine to limit how many shells. When not hunting, the plug is not required. It IS required when hunting any migratory bird- such as ducks, geese or dove.
That depends on the shotgun and whether it as a "sporting plug" installed. A plug will limit the gun to three in the magazine. Without the plug, the gun may hold a few more. General, no more than five or so however magazne extensions can push that to eight or more.
A pump or auto suppose to be plugged so no more than 2 shells in magazine and 1 in chamber
yes
2 rounds in magazine and plugged to prevent more.
in the easy mode i like used more that 20 shells from different guns.
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Because the shell can only hold eight electrons. check
You will have to find someone who specializes in collecting them. Otherwise, they are not worth any more than a regular box of shotgun shells.
You need the services of a gunsmith. There are about a half dozen or so reasons if not more.