Purpose-built PRS competition cartridge designed for optimal performance with heavy-for-caliber 6mm bullets. SAAMI standardized in 2021. Balances velocity, barrel life, and recoil for gas-gun competition.
Type: Rifle
Introduced: 2021, United States
Parent case: 6.5 Creedmoor
Standardization: SAAMI
Bullet diameter: 0.243" (6.17 mm)
Case length: 1.82" (46.23 mm)
Overall length: 2.8" (71.12 mm)
Max pressure: 63,000 PSI
Rim type: Rimless
Primer: Small Rifle
Typical twist rate: 1:7.5
Muzzle velocity: 2900–3050 fps
Muzzle energy: 1950–2200 ft-lbs
Effective range: 1200 yd
Common bullet weights: 105, 107, 108, 109, 110, 115 gr
Primary use: Competition, Target
Production status: Active
Also known as: 6mm GT · 6 GT
History: Developed by George Gardner of GA Precision and Tom Jacobs of Vapor Trail Bullets specifically for Precision Rifle Series competition in semi-automatic rifles. The goal was a cartridge that fed reliably from AR-10 pattern magazines while shooting the heaviest, highest-BC 6mm bullets with less recoil than 6mm Creedmoor. Submitted to SAAMI and standardized in 2021 — unusually fast adoption for a…
Notable firearms: GA Precision Tempest, Ruger Precision Rifle, Various custom AR-10 builds
Similar cartridges: 6mm Creedmoor, 6 Dasher, 6mm GT, 6.5 Creedmoor