Because of these inherent low pressures of the standard pressure round, however, compensators and brakes have little effect until P and Super loads are utilized.With standard (not extended) single-stack magazines, pistols chambered in .45 ACP usually hold 8 rounds or less (exceptions to this include the 10-round standard 14 round extended capacity .45 ACP from Sig Sauer in their P227 While high capacity firearms are available in .45 ACP, the greater length and diameter of the .45 ACP means that the grip of the pistol must be longer and wider than the grip of a comparable pistol of a smaller caliber; this increase in grip size can make the pistol difficult to use for shooters with smaller hands.The downside to the use of .45 ACP in suppressed weapons is that increasing the diameter of the passage through a suppressor decreases the suppressor's efficiency; thus, while .45 ACP is among the most powerful suppressed pistol rounds, it is also one of the loudest.
They noted, however, training was critical to make sure a soldier could score a hit in a vulnerable part of the body.
The Army had fielded some double-action revolvers in .38 Long Colt.
They determined the .38 caliber round was significantly less effective than the .45 Colt against determined opponents such as the Moro juramentado warriors encountered in the Moro Rebellion.
The standard issue military .45 ACP round has a 230-grain bullet that travels at approximately 830 feet per second when fired from the government issue M1911A1 pistol and approximately 950 feet per second from the M1A1 Thompson submachine gun.
The cartridge also comes in various specialty rounds of varying weights and performance levels.