Two Letters Re: Comparing the Big Three Battle Rifle Chamberings in the United States
Jim: The recent article [by Kyrottimus] that stated that at 50 yards a typical 45 ACP and 9mm [Parabellum] will have the same energy is wrong. .45 ACP 230 gr ~390 ft/lbs (528 joules) @ 875 fps (JHP) 9x19mm Luger/Parabellum 115 gr ~385 ft/lbs (521 joules) @ 1,225 fps (JHP) His additional assumption, that bullets will slow equally in an air mass, is also wrong. I noticed that he listed the fps for a 9mm cartridge at 1,225 fps. This is the energy for a 9mm +p+ range cartridge, while comparing it to the 45 ACP ball cartridge, not a …