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The 6mm GT is a rifle cartridge design by George Gardner (owner, GA Precision) and Tom Jacobs (owner, Vapor Trail Valley Bullets) that optimizes cartridge dimensions for low SD's and extremely consistent performance both on the bench and in practical precision application (PRS style competitions).  The 6mm GT features a 35 degree shoulder for trouble-free feeding, specifically with detachable magazine systems. No magazine inserts or modifications are required; just use standard out-of-box 308 Win. AICS or AW magazines. Optimal case efficiency nearing 100% volume usage @ 33-35 grains of Varget. Capable of reaching 3020-3100 fps with 103-105 grain bullets or approximately 3000 fps with 115's.

The Alpha 6mm GT brass uses Small Rifle primers and ships in 100 count custom Alpha Munitions plastic cases with perforated bi-layer foam for protection of cases during shipping and can be used for loaded ammunition.

Each 6mm GT case produced by Alpha Munitions also incorporates the company's OCD with optimized case head technology, which is designed to lengthen primer pocket life, as well as the life of the case overall, even at higher than normal pressures and velocities.