Both devasting punching middleweights

Both are great punchers but McClellan had more power. Pretty much one-punch knockout power.

The G-man was a KO artist

Both devasting punching middleweights

P4p this is probably a much closer comparison compared to h2h at middleweight. McClellan was a huge middleweight who rarely weighed in at or below the 160lb limit. Had he had to weigh in the same day, as back when Graziano fought, I highly doubt he would have ever even fought at middleweight.