It depends on the pistol make and model, and what it is chambered for. Most semi-autos nowadays hold at least 12 rounds. Most revolvers hold six.
Some hold as few as 1 or 2, some hold as many as 30 (or more), so it depends on which pistol and what magazine it has.
A 22 caliber pistol holds a dose of 22 caliber ammo.
No, it is not legal.
Calico
Known as the grip or butt.
Depends on the pistol. Typically 10 rounds for a Colt Woodsman.
That number of rounds can vary. Most of us are familiar with revolvers that hold six rounds. Some pistol magazines can hold up to 13 and more. I know of one revolver with a cylinder that holds nine rounds.
The bookie's hold out pistol has an attack value of 24 and a defense value of 12. k.
None. No such gun.
6, IIRC
Depends on who made it.