M60 is still an outstanding tank. A lot of armies still using them and upgrading them. A good work horse.
My experience with it (although minimal compared to you) was the opposite. Buddy of mine has one, use it at the range every once in a while. It's only semi auto because obviously here in the US can't have fully auto but if you know how to pull the trigger in quick succession, you can empty a clip pretty fast and that one has a pretty solid recoil on it. You can even see it in that video. It's a great assault rifle and actually very accurate. But I get pushed back a bit after a burst and I'm 6ft 200lbs lol. Does a number on your armpit too. You must be a big, tough guy!
My Chinese MAC-90 (Chinese AK-47 copy with the thumb-grip stock) has a very similar recoil to the Styer AUG and it's 7.62. Out of all our AKs, that one is the most similar to the Styer AUG IMO which is a bit strange since the latter is the smaller caliber.