.22 Creedmoor

22 Creedmoor denotes the fact that it comes from a 6.5mm Creedmoor which has been necked down to accept a .224 bullet, the Creedmoor in 6.5mm Creedmoor in turn comes from Creedmoor Sports, for whom the 6.5mm Creedmoor cartridge was developed by Hornady and Creedmoor Sports jointly.