Starline Unprimed Brass Cases 6.5 Creedmoor (50PK) - RNA. K. A 6. 5mm CM, 6. 5mm Creedmoor 1. 908 1. 912 O. A. L. The 6. 5 Creedmoor was designed as a target calibre in 2007 by Hornady but has become an extremely popular hunting calibre as well. While it isn't as long as some of the other 6. 5 calibre short action calibres, such as the . 260 Remington, the Creedmoor utilizes a 30 degree shoulder and very little body taper to help it achieve similar ballistics. The shorter length also gives it more