To be fair though there's not many Gorrillas make black belt .How hard can a gorilla punch?
Gorillas are 4 to 9 times stronger than human. Assume that the punch strength of a Gorilla and human has the same ratio. The average punch force of karate black belt is recorded at 325 pounds. So the punch force of a gorilla could be from 1300 lbs to 2700 lbs.
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How Strong Is A Gorilla - Gorilla Strength vs Human - Gorilla Facts