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22 WMR Ships for Free from!

22 Winchester Magnum Rimfire (WMR) is a rimfire cartridge most commonly loaded with a 40-grain projectile. Winchester introduced the caliber in 1959 where it was originally used in rifles but it didn't take long for Ruger and Smith & Wesson to introduce revolvers chambered for 22 WMR as well. Today, .22 Magnum shooters have a round that's awesome for plinking but can also be used to take down smaller varmints.