The AK-47 uses the 7.62x39mm round. Note that the AK-74, a similar firearm uses the different 5.45x29mm round.
7.62×39mm
The AK-47 shoots a 7.62 x 39mm bullet. The 39mm indicated the length of the brass/steel case.
7.62x39mm
7.62x39
The term "762" refers to a 7.62mm bullet. This is a common size for European guns and the AK-47. The 54 refers to the length of the round or the powder, I forget. Not sure exactly what bullet this describes but that is the diameter size (caliber) of the bullet.
In the 2000-2200 fps range.
1776mph over 2000fps
one hundred and twenty three pounds
Best left to a gunsmith
Very small trees.
The AK-47 and AKM use the 7.62x39 cartridge.
The cartridge is 7.62mm x 39mm long.