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.408 Chey Tac
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Caliber Specifications:
Caliber: | .408 Chey Tac |
Standard / Datasheet: | Piezo |
Bullet Diameter: | 0.408" | 10.36mm |
Primer Size: | Large Rifle Magnum (LRM) |
Max. Case Length: | 3.040" | 77.22mm |
Max. Cartridge Length / OAL: | 4.515" | 114.68mm |
Max. Standardized Pressure: | 63817 psi | 4400 bar |
Case Capacity: | 169.0 Grains of Water | 10.97 cm3 |
CID: | CID_664 |
Last updated: | 3/8/2025 |
- The .408 Cheyenne Tactical (designated 408 Chey Tac (10.36×77mm) by the C.I.P.[3] from 2013 to 2021) is a specialized rimless, bottlenecked, centerfire cartridge for military long-range sniper rifles that was developed by Dr. John D. Taylor and machinist William O. Wordman. The round was designed with a possible military need for a cartridge for anti-personnel, anti-sniper, and anti-materiel roles with a (supersonic) precision range of 2,200 yards (2,000 m). It is offered as a competitor to the most common military NATO long-range service cartridges such as .338 Lapua Magnum and the .50 BMG.
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Most popular powders from our community members for caliber .408 Chey Tac:
Weight vs. Velocity - Suitable Bullets for this Caliber
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Barrel Length Variation vs. Velocity - by Bullet Weight
.408 Chey Tac load data available with the following bullets:
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