A hot rodded 45 ACP is basically a 45 super which energy wise pretty close to 10mm.
Yes.
I'm no .45 ACP expert, but you mentioned KE. Can you get 868 ft-lbs out of a 6" 45 ACP or 700 ft-lbs out of a 3.8" 45 ACP? Underwood does that with the 10mm. See above.
