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9.5 x 77 (.375 CheyTac®) Brass Rifle Casing

Many of the people familiar with the history of the CheyTac® (Cheyenne Tactical) name know it has been damaged over the years for a wide variety of reasons. The caliber is a valuable and productive round and deserves to be in service, for the traits it possesses. As of the fourth quarter 2016, Peterson Cartridge has brass cases for guns chambered in both the .408 (10.36 x 77) and the .375 (9.5 x 77). The Peterson cases use NATO designations. The 10.36 x 77 can replace the .408, and 9.5 x 77 replaces the .375.

The .375 (9.5 x 77) CheyTac is manufactured on our state of the art case manufacturing line. All our casings are tested and held to the highest standards and are available length and weight sorted directly from the factory in our Peterson Select line.

The story of Peterson Cartridge developing a superior brass casing

As you may know, the larger the caliber the harder it is to make consistent, high quality casings. The .408 (10.36 x 77) and the .375 (9.5 x 77) were no exception. Our tooling development team spent 17 long months and over 1,000 man-hours, and produced 49 different iterations of dies and stems before landing on the best combination to make a casing we believe to be superior to the other casings commonly used in CheyTac® chambered guns.

The goal we set for ourselves was to produce .408 (10.36 x 77) and .375 (9.5 x 77)  casings with hardness values throughout the head and sidewalls as close as possible to standard hardness values Lapua uses for their .338 Lapua Mag. Our ballistician has repeatedly gotten as many as 15 reloads from our casings without sticking, neck splits or head separation.

Learn more about our development process and how Peterson’s CheyTac-caliber casings compare.


History Of The 9.5 x 77 (.375 CheyTac®) 

The 9.5 x 77 (.375 CheyTac) was originally adapted from the 10.36 x 77 (.408 CheyTac) by wildcatters who first started by changing the shape and internal volume of the .408 but later moved on to creating different calibers from the original .408 in  .338, .375, .416, and .510. The 9.5 x 77 (.375 CheyTac) was the most popular among shooters and was added to the factory chamberings by CheyTac USA in 2007.

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Extremely consistent, American-made brass rifle casings and ammunition, designed for long-distance shooters.