I recall reading exerts from the Falklands war, where people were being hit with the 7.62mm and not going down to the surprise of the Soldiers.
One article I read said the 7.62mm didn't perform as well as expected, inferior to the .303 previously fielded.
Unfortunately I don't have that info anymore.
The .303 would knock a donkey down!
I'm still cleaning mine up, but I can't wait to take it to the range.