It first appeared in the Marlin Model 57M Levermatic carbine in 1959, which was followed by the. 22 WMR and as convertible kits with both cylinders which allow the shooter to easily switch calibers on the same firearm. 22 revolver models with cylinders chambered either in. 22 WMR chamber results in swollen or split cartridge cases, high pressure gas leakage from the rear of the chamber, and bullets striking the chamber throat out of alignment, which can result in injury to the shooter or bystander and which does result in poor ammunition performance.
22 WMR chamber does not support the smaller. 22 LR firearm.Īlthough the bullet diameters are the same, the larger. 22 WMR round will not fit into the chamber of a. 22 WMR loadings using a 40-grain (2.6 g) bullet, the combination of more powder and higher sustained pressures gives velocities of 1,875 feet per second (572 m/s) from a rifle and 1,500 feet per second (460 m/s) from a handgun. 22 WMR case is a lengthened version of the older. 22 Long Rifle (LR) both in diameter and length.
22 WMR uses a larger case than the more popular.
