The fastest commercial 6.5mm cartridge ever produced. A 130-grain bullet at 3,531 fps from Weatherby's full-length .300 Wby case necked to 6.5mm — generating more velocity than any other factory 6.5mm by a substantial margin.
Type: Rifle
Introduced: 2016, United States
Parent case: .300 Weatherby Magnum
Standardization: SAAMI
Bullet diameter: 0.264" (6.71 mm)
Case length: 2.825" (71.76 mm)
Overall length: 3.56" (90.42 mm)
Max pressure: 62,000 PSI
Rim type: Belted
Primer: Large Rifle Magnum
Typical twist rate: 1:8
Muzzle velocity: 3200–3531 fps
Muzzle energy: 3037–3507 ft-lbs
Effective range: 700 yd
Common bullet weights: 127, 130, 140 gr
Primary use: Hunting, Target
Production status: Active
Also known as: 6.5-300 Wby Mag · 6.5x300 Weatherby
History: Weatherby introduced the 6.5-300 in 2016 to ride the 6.5mm wave sweeping the precision rifle market. Their approach was characteristically Weatherby: take the largest viable case and neck it to 6.5mm. The result is dramatically faster than 6.5 Creedmoor, 6.5 PRC, and even .26 Nosler. The flat trajectory and high BC of 6.5mm bullets combine with Weatherby velocity to produce a long-range hunting…
Notable firearms: Weatherby Mark V
Similar cartridges: 6.5mm Weatherby RPM, 6.5 PRC, .26 Nosler