.408 Cheytac
The **.408 CheyTac**, also known as the **.408 Cheyenne Tactical**, is a specialized centerfire rifle cartridge developed for extreme long-range shooting, offering a balance between the size and power of the .50 BMG and smaller precision cartridges such as the .338 Lapua Magnum.
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Developed in the early 2000s by CheyTac USA with ballistic work associated with Dr. John D. Taylor and William Wordman, the cartridge was derived from the **.400 Taylor Magnum**, itself based on the .505 Gibbs case. The .408 CheyTac was designed around highly aerodynamic .408-inch projectiles with exceptionally high ballistic coefficients, allowing them to retain velocity and energy while resisting wind drift over very long distances. It became closely associated with CheyTac’s Intervention rifle system and gained considerable attention for its performance at ranges extending well beyond 1,000 yards. Today, the caliber remains relatively specialized because rifles, ammunition, and components are considerably less common and more expensive than mainstream long-range cartridges. Its current uses center primarily on **extreme long-range target shooting, ELR competition, specialized military or law-enforcement applications, and long-range ballistic experimentation**. Although newer ELR cartridges now compete with it, the .408 CheyTac remains one of the best-known purpose-designed extreme-range cartridges and played an important role in popularizing modern ELR shooting.
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