my opinion is the 45 ACP round has more knock down powder then the 40 caliber
Depends on the load.
I don't believe so.......................
No
Given proper shot placement, none.
85-40 = 45 and 45+45 = 90
A 44 magnum is more powerful than a 45calibur
maybe 80 feet at 45 degrees
If you are referring to the present, today's most powerful sub-machine gun is the H&K UMP .45 cal sub-machine gun, or the Kriss Vector SMG. if you are referring to the past however then its undeniably the Tommy Gun. also a .45 cal sub-machine gun.
.40 is the more powerful ---------- I would have to beg to differ on that one. The highest energy .40 S&W round produces 500 ft/lb... that's the 155 grain Guardian Gold @ 1205 fps. The 200 grain Speer Gold Dot in .45 ACP produces 518 ft/lbs, while the 185 grain bonded defense produces 616 ft/lbs. So sure, there are some .40 loads which produce more energy than some .45 ACP loads, but overall? No.
.17....22 Cal....32 Cal....38 Cal....9mm....40 s&w....357 m......44 special....44magnum...45 Cal....454 Cal.....500 magnum......50cal
200-2000 or more