Modern straight-wall cartridge for AR-15 platform. Designed for Midwest straight-wall deer hunting regulations. Low recoil, good energy, abundant ammunition.
Type: Rifle
Introduced: 2019, United States
Parent case: .223 Remington
Standardization: SAAMI
Bullet diameter: 0.357" (9.07 mm)
Case length: 1.71" (43.43 mm)
Overall length: 2.25" (57.15 mm)
Max pressure: 55,000 PSI
Rim type: Rimless
Primer: Small Rifle
Typical twist rate: 1:16
Muzzle velocity: 2100–2350 fps
Muzzle energy: 1500–1800 ft-lbs
Effective range: 250 yd
Common bullet weights: 145, 150, 160, 180, 200 gr
Primary use: Hunting
Production status: Active
Also known as: .350 Leg
History: Introduced by Winchester in 2019 specifically for states requiring straight-wall cartridges. Instant success due to AR-15 compatibility and excellent ballistics. Fastest-adopted deer cartridge in decades.
Notable firearms: AR-15, Winchester XPR, Ruger American Ranch, Savage Axis
Similar cartridges: .223 Remington, .450 Bushmaster, .30-30 Winchester