.22 Nosler cartridge introduced January 2017 by Nosler . The 22 Nosler is a 22 (.224″) caliber, rebated-rim centerfire rifle cartridge designed by Nosler. The 22 Nosler is a SAAMI approved and standardized cartridge. It is the fifth cartridge designed by Nosler. It is claimed that the 22 Nosler delivers 25% more case capacity and is nearly 300 fps faster than a .223 Remington/ 5.56 NATO. This cartridge is designed to use the existing bolt face of an AR-15, and conversions to this caliber can be accomplished with a simple upper receiver swap. The shoulder is set back slightly compared to the 5.56 cartridge to prevent accidentally chambering a 5.56 cartridge in a 22 Nosler rifle. The case diameter and taper resemble those of the 6.8mm Remington SPC, so Nosler recommends using a magazine designed for that cartridge. While similar to the 6.8SPC in some regards, there is no parent case and the 22 Nosler cannot be formed from 6.8SPC brass.