I read on this site years ago that a wide open 40 with a 10/6 prop has tips moving at the same speed as a 45 calibur bullet.
Interesting claim, with some merit. However the speed of a .45 bullet varies all over the place, from low 800ft/sec to as much as 1150 ft/sec. A very healthy Jett Engineering .40 can turn a 10-6 APC at 16,500 giving a static tip speed of only 720 ft/sec.
So I guess the .45 bullet still wins, and the old saying about never taking a knife to a gun fight continues to be true.