The .22 Winchester Magnum Rimfire has been with us for more than half a century. Relatively popular in rifles, it’s also been a favorite option for rimfire revolvers. Semiautos? Not so much. Today, other than KelTec’s PMR 30 and Rock Island Armory’s XT 22 Magnum series, there are...well, that’s pretty much it. Until now, with Walther’s introduction of the WMP or Walther Magnum Pistol. 

Why are there so few? Mostly because it’s hard to get this cartridge to function reliably in a semiautomatic pistol. Jens Krogh, vice president of marketing and product development at Walther, said he believes the company has cracked that code. 

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