The AK-47 uses the 7.62x39mm round. Note that the AK-74, a similar firearm uses the different 5.45x29mm round.
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The typical AK-47 fires a 7.62x39mm round. The 7.62mm refers to the bullet's diameter, which is basically .30 caliber. the 39mm refers to the length of the brass case which holds the bullet.