Starline 6mm Creedmoor SRP Brass Cases (Small Rifle Primer) 6mm Creedmoor Small pocket The SR 6mm CM is our small rifle primer version of the 6mm Creedmoor. Just like our SR 6.5 CM, we utilize the standard .080" flash hole diameter, as we feel this gives better ignition with slower burning and hard to ignite powders.*The 6mm Creedmoor is the little brother to the very popular 6.5 Creedmoor. It has similar ballistics to the .243 Winchester, but its shorter length allows long, heavy bullets to be seated in the magazine. This caliber is an excellent choice for hunting, but its popularity was gained as a competition cartridge. Some of the new competitions, such as the Precision Rifle Series, require a lot of shooting and this cartridge is easy on the shoulder, even compared to the 6.5 Creedmoor. There are several companies now making bolt action and AR-10 type rifles for this caliber. O.A.L.: 1.908-1.912 100 count by weight