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22WMR Rimfire Cartridge
Rimfire cartridges contain the priming compound in the rim of the cartridge, the cartridge case itself contains the gunpowder.
Written by: Kim Lockhart, Copyright.

Actual Picture Of 22 Winchester Rimfire Magnum Cartridge22 Winchester Magnum Rimfire: (.22WMR)
 The .22 Winchester Magnum Rimfire is a .22" caliber rimfire cartridge that was introduced in 1959 by Winchester, and it was the only truly successful rimfire cartridge introduced in the 20th century. .22 Winchester Magnum Rimfire, is a rimfire rifle cartridge, commonly loaded with a 40 grain bullet, it can deliver velocities in the 2000 fps. range from a rifle barrel. The .22 Winchester Magnum Rimfire uses a larger case than the more popular .22 Long Rifle rimfire, both in diameter and length. The .22 Winchester Magnum Rimfire's case is also much thicker, allowing much higher pressures. Since the .22 Winchester Magnum Rimfire generally uses the same weight bullets as the .22 Long Rifle, it is generally used in similar situations. The 40 grain .22 Winchester Magnum Rimfire at 100 yards still retains the velocity of a .22 Long Rifle at the muzzle, which can provide improved penetration at all ranges, and more reliable expansion at long range with expanding bullets.
Cartridge case length is 1.052".

Rimfire Cartridges:
.17 HM2
.17 HMR
.17 WSM
5mm Rem. Mag.
.22 BB Cap
.22 CB Cap
.22 Short
.22 Long
.22 Long Rifle
.22 WRF
.22 WMR
Rimfire Rifle Ballistics:
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Rifle Cartridges And Reloading - Rifle Cartridges And Ballistics