About
The .45 Auto Rim Ammo, also known as the 11.5x23R, is a rimmed cartridge explicitly designed to be used in revolvers initially chambered for the .45 ACP Ammo. The .45 Auto Rim Ammo was developed in 1920 in the United States. Issues with .45 ACP Ammo led to creating the .45 Auto Rim Ammo. The first issue was that some of the spent cases needed to be removed by hand or a stick, which was a nuisance. The second issue concerned the headspace; the .45 ACP could slip forward in the M1917s, stopping them from being fired. However, adding a rim to the .45 ACP Ammo solved these issues. Loads offered for the .45 Auto Rim ammo were similar to the .45 ACP Ammo but were fully lead bullets. The lead bullets reduced the barrel wear in the shallow revolvers. The overall length of the .45 Auto Rim Ammo is 32.12mm, and the bullet diameter of the cartridge is 11.5mm. The 16-grain bullet is the lightest variant of the .45 Auto Rim Ammo, which can travel at a velocity of 1,050 feet per second and create an energy level of 392 ft.lbf.
Manufacturer
The .45 Auto Rim Ammo was produced by Peters Remington Corbon in 1920.
Uses
The .45 Auto Rim Ammo was created to replace the .45 ACP Ammo in the M1917s because of its gun issues.
