I also think Callum Smith must be up there, Hearn has already stated before he was his hardest hitting boxer p4p, and he is same weight as Froch.
I know that he has been mentioned before, but Naseem Hamed had the type of power that I do not think that you are able to train or teach. He just seemed to have more power than someone his size should have ever possessed. It was always fun to see him beat on people.
Jimmy Wilde's power is far more impressive than Naz. He sparked out guys much bigger than himself. Hameds power is not on that level. Wilde was a small very skinny flyweight but he could ko much bigger men. He was built like a ten year old kid. He was a freak.
Even after the second fight I still feel Groves is a more power puncher than Froch in terms of one punch power. Its just where Froch's chin is pure granite and Groves has a suspect chin.
Punch of his life, as he's said. Froch wouldn't be in the top 10. Definitely culmative/pressure punches in bulk as someone else said.