The SOCOM is an awesome cartridge that is basically a long 50AE (O.A.L. of 1.575") with a rebated .308 style head configuration, necked down to utilize a .458" diameter projectiles. It has been chambered in some bolt guns but it's claim to fame is in the AR-15 platform. Complete firearms and uppers are available from www.wilsoncombat.com , www.teppojutsu.com or call (832) 524-8100 or www.rockriverarms.com or call (866) 980-7625. Dies are available from most major manufacturers.
Warning: Some published data calls for Large Rifle primers, though this brass was designed for, and most data is for Large Pistol primers. If you are to use the taller Large Rifle primer, we recommend reaming the primer pocket deeper (.125”-.132”). Seating the Large Rifle primers in a standard Large Pistol pocket may cause high primers, which could cause slam-fire issues and chambering issues in general.