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.300 Win Mag
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The .300 Winchester Magnum is a belted, bottlenecked magnum rifle cartridge that was introduced by Winchester Repeating Arms Company in 1963. The .300 win mag rifle is a magnum cartridge designed to fit in a standard rifle action.
The .300 Winchester Magnum is a magnum cartridge designed to fit in a standard rifle action. It is based on the .375 H&H Magnum, which has been blown out, shortened, and necked down to accept a. 30 caliber 7.62 mm bullet.
The .300 Winchester Magnum was introduced in 1963 by Winchester for use in the Model 70 rifle. The introduction of the .300 Winchester Magnum was not unforeseen; rather, its introduction was anticlimactic. Winchester developed the .300 Winchester Magnum by taking the .338 Winchester Magnum, which was introduced in 1958, and moved the shoulder forward by 4.0 millimeters (0.156 in) and lengthening it by 3.0 millimeters (0.120 in).
About: .300 Win Mag
- Type: Rifle, Large game
- Place of origin: United States
- Designer: Winchester Repeating Arms Company
- Designed: 1963
Specifications
- Parent case .375 H&H Magnum
- Case type: Belted, bottleneck
- Bullet diameter: .308 in (7.8 mm)
- Neck diameter: .339 in (8.6 mm)
- Shoulder diameter: .489 in (12.4 mm)
- Base diameter: .513 in (13.0 mm)
- Rim diameter: .532 in (13.5 mm)
- Rim thickness: .049 in (1.2 mm)
- Case length: 2.62 in (67 mm)
- Overall length: 3.34 in (85 mm)
- Case capacity: 93.8 gr H2O (6.08 cm3)
- Rifling twist: 1:10 (254 mm)
- Primer type: Large Rifle Magnum
- Maximum pressure (C.I.P.): 62,366 psi (430.00 MPa)
- Maximum pressure (SAAMI): 64,000 psi (440 MPa)
- Maximum CUP: 54,000 CUP
Ballistic performance
| Bullet mass/type | Velocity | Energy |
|---|---|---|
| 165 gr (10.7 g) GMX | 3,300 ft/s (1,000 m/s) 3,990 | ft⋅lbf (5,410 J) |
| 180 gr (11.7 g) BT | 3,193 ft/s (973 m/s) 4,076 | ft⋅lbf (5,526 J) |
| 190 gr (12.3 g) BTSP | 3,117 ft/s (950 m/s) 4,100 | ft⋅lbf (5,600 J) |
| 200 gr (13.0 g) Partition | 3,029 ft/s (923 m/s) 4,092 | ft⋅lbf (5,548 J) |
| 220 gr (14.3 g | 2,875 ft/s (876 m/s) 4,038 | ft⋅lbf (5,475 J) |
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