Guess you never heard of Corbon Powerball, it pushes a .45 ACP to 1225fps. and is bought over the counter....not "homemade".
Nope, never heard of a 265grain bullet at 1225 out of a 45acp. If you can order me a box, I'll take them for any price you attach to them. Consider them sold pending meet.
You only looked at half of the equation for foot pounds of energy my friend....mass is pretty important too.
Corbon used to load some 300 grain 45 colt loads to 1300 fps, even some 335 HC's in the velocity range your 165gr acp travels. There simply isn't enough room in the casing for 45acp to be able to compete with the 45 Colt in terms of energy.
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