.22 PDK

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.22 PDK is a .224-caliber wildcat cartridge designed by Roy Winnett, based on the 6.8mm Remington SPC case, known as "The Prairie Dog Killer". It is intended for use in AR-15–style rifles and, is a precursor to the .22 Nosler.{{Cite web |last=Mann |first=Richard |date=7 August 2017 |title=Shooting Illustrated |url=https://www.shootingillustrated.com/content/the-22-nosler-best-ar-15-cartridge-yet/#:~:text=About%2010%20years%20ago%2C%20an,223%20Rem. |archive-url=https://web.archive.org/web/20210925115223/https://www.shootingillustrated.com/content/the-22-nosler-best-ar-15-cartridge-yet/ |archive-date=25 September 2021}}{{Cite web |title=Field & Stream |url=https://www.fieldandstream.com/guns/weird-wildcat-cartridges#:~:text=2.,diameter%20to%20that%20of%20a%20.}} The .22 PDK is known for its ability to drive 55-grain bullets at 3550 FPS and, 77-grain bullets at 3100 FPS from a 20" AR-15. The .22 PDK was originally a custom cartridge, not a commercially available ones like the .22 LR.

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