45 ACP (Automatic Colt Pistol)
45 ACP Ammo (Automatic Colt Pistol) or . 45 Auto (11.43×23mm) is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol. After successful military trials, it was adopted as the standard chambering for Colt’s M1911 pistol.
A 9mm is smaller and lighter compared to the . 45 ACP. Therefore, it moves more quickly and has more penetration into the target. In addition to that, it also has higher velocity, giving more stopping power to halt the bullet. The . 45 ACP (Automatic Colt Pistol) cartridge holds bullets that have a diameter of . 452 inches (11.5mm) so it is slightly larger than the 9mm (. 355 inch bullets). 45 ACP Ammo
A 45 bullet typically has 355 ft-lb of muzzle energy. For a handgun, this is an insane amount of power. 45 bullets also tend to hold more gunpowder than a 9mm. As you may already know, the larger bullet requires a more powerful burning of gunpowder to send it out of the barrel.