I don't know about ft/lbs, but I saw some old karate (ISKA, or something, I forget) matches, and before the matches, the contenders would throw techniques into this heavy bag with a meter on it to measure PSI. The really good/hard punches and kicks were around 2,000 PSI, which is a serious amount of ouch.
That said, these guys were pros, and they could hit like MFers, obviously. I don't know if they could hit quite as hard as some of the heavyweight pro boxers, but probably close.
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Jayman
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