Ultra long-range precision cartridge. Designed for 2,000+ yard shots. Extremely high ballistic coefficient bullets for minimal wind drift.
Type: Rifle
Introduced: 2001, United States
Parent case: .505 Gibbs
Standardization: Proprietary
Bullet diameter: 0.408" (10.36 mm)
Case length: 3.035" (77.09 mm)
Overall length: 4.73" (120.14 mm)
Max pressure: 65,000 PSI
Rim type: Rebated
Primer: Large Rifle Magnum
Typical twist rate: 1:13
Muzzle velocity: 2850–3050 fps
Muzzle energy: 7600–8900 ft-lbs
Effective range: 2500 yd
Common bullet weights: 305, 419, 450 gr
Primary use: Military, Target
Production status: Active
Also known as: .408 CT · 10.3x77mm
History: Developed in 2001 by CheyTac Associates for extreme long-range precision shooting. Part of complete Intervention weapon system including rifle, ammunition, and ballistic computer. Specifically designed for consistent accuracy beyond 2,000 yards. The .408 diameter was chosen for optimal balance of BC, sectional density, and manageable recoil. Used for extreme long-range military sniping and…
Notable firearms: CheyTac M200 Intervention, EDM Arms Windrunner, Desert Tech HTI
Similar cartridges: .416 Barrett, .375 CheyTac, .338 Lapua Magnum