6.5-300 Weatherby Magnum

The 6.5-300 Weatherby Magnum is a 6.5mm cartridge created by Weatherby in 2016 for the growing 6.5mm long-range rifle market.^[2]

6.5-300 Weatherby Magnum
Left: 6.5mm Grendel. Right: 6.5-300 Weatherby Magnum.
Type	Rifle
Place of origin	USA
Production history
Designer	Weatherby
Designed	Roy Weatherby experimented with the design in the 1950s. It wasn’t commercialized until 2016.
Manufacturer	Weatherby
Produced	2016
Specifications
Parent case	.300 Weatherby Magnum
Case type	Belted, bottleneck
Bullet diameter	.264 in (6.7 mm)
Shoulder diameter	.4949 in (12.57 mm)
Base diameter	.512 in (13.0 mm)
Rim diameter	.5315 in (13.50 mm)
Case length	2.825 in (71.8 mm)
Overall length	3.600 in (91.4 mm)
Case capacity	98 gr H2O (6.4 cm3)
Rifling twist	1-8"
Primer type	Large rifle magnum
Ballistic performance
Bullet mass/type Velocity Energy 127 gr (8 g) LRX 3,531 ft/s (1,076 m/s) 3,516 ft⋅lbf (4,767 J) 130 gr (8 g) Scirocco 3,476 ft/s (1,059 m/s) 3,487 ft⋅lbf (4,728 J) 140 gr (9 g) A-Frame 3,395 ft/s (1,035 m/s) 3,583 ft⋅lbf (4,858 J)
Test barrel length: 26 Source(s): Weatherby[1][2]

Background

As what was then the newest in Weatherby's lineup, this cartridge was designed to directly compete with the 26 Nosler.^[3]

Performance

Claimed by Weatherby to be the fastest 6.5mm cartridge available.^[4]

Designed in a similar fashion as other Weatherby cartridges, it has a large-for-caliber case capacity, resulting in high velocities. When bullets with high ballistic coefficients are used, trajectories are extremely flat, allowing the projectile to retain a significant amount of energy downrange.^{[citation needed]}

Availability

Weatherby is currently^[when?] the only manufacturer of rifles chambered in the 6.5-300 Weatherby Magnum, as well as the only current supplier of ammunition. However, cases could be formed from .300 Weatherby Magnum brass.^{[citation needed]}

See also

• List of rifle cartridges
• Table of handgun and rifle cartridges