Depends entirely on the firearm. With repeating arms, it will be operation of the action. That can be cycling the bolt, lever, pump or operating handle. With a single shot it is placing a cartridge by hand in the chamber.
A Chambered round.
No. It is chambered for the .45 ACP cartridge.
Chambering
Yes
The AK-47 assault rifle is chambered for the 7.62x39mm round, which is of the 7.62 millimeter caliber.
.32 Automatic is the same as a european 7.65 pistol round.
Many different models have been chambered for this round.
Only if chambered in 30/06
After a round has been chambered
no AK-47 is chambered for 7.62x39mm..... just AK-101 and AK-102 can fire with M-16 round (5.56x45mm)
they were chambered in 30-30 so, perhaps you should try that first.
Any firearm that is chambered for it. Hungary makes a hand gun that fires this round.