One or two, depending on how many barrels the shotgun has.
Depends on gauge.
As many as the magazine is capable of holding.
They don't carry ammo in boxes. Basic load depends on the weapon system. 210 rounds for the M4 or M16, 600 - 800 rounds for the M249, 800 - 1000 rounds for the M240.
Limits the number of rounds which can be loaded. Typically, in US laws for waterfowl hunting, a repeating shotgun is only allowed two rounds in the magazine, and one in the chamber, for a total of three rounds.
How many cartridge does a 12 gauge shotgun carry.
Only one can be in the gun when shooting singles and two for doubles
2 rounds in magazine and plugged to prevent more.
60
Yes
The Saiga 12 is nothing short of a semi automatic shotgun with the ability to handle up to 10 rounds in a detachable magazine. The shotgun can also be equipped with a barrel magazine cable of handling up to 30 shotgun rounds.
In the US, 18 for rifle and shotgun rounds, 21 for handgun rounds. Enforcement is something else entirely.