.300 Winchester Magnum
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| .300 Winchester Magnum | ||
|---|---|---|
 .300 Win Mag, third from right |
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| Type | Rifle, Large game | |
| Place of origin |  United States |
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| Production history | ||
| Designer | Winchester Repeating Arms Company | |
| Designed | 1963 | |
| Specifications | ||
| Parent case | .300 H&H Magnum | |
| Case type | Rimmless, 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) | |
| Rifling twist | 1:10 | |
| Primer type | Large rifle | |
| Maximum pressure | 62,366 psi (430.00 MPa) | |
| Maximum CUP | 54000 CUP | |
| Ballistic performance | ||
| Bullet weight/type | Velocity | Energy |
| 165 gr (10.7 g) Nosler partition | 3,050 ft/s (930 m/s) | 3,408 ft·lbf (4,621 J) |
| 180 gr (12 g) Nosler partition | 2,960 ft/s (900 m/s) | 3,502 ft·lbf (4,748 J) |
| 190 gr (12 g) BTHP | 2,900 ft/s (880 m/s) | 3,548 ft·lbf (4,810 J) |
| 150 gr (9.7 g) SP | 3,290 ft/s (1,000 m/s) | 3,605 ft·lbf (4,888 J) |
| 200 gr (13 g) SP | 2,700 ft/s (820 m/s) | 3,237 ft·lbf (4,389 J) |
| Test barrel length: 24 in Source: Federal Cartridge [1] / Rifle Sporting Firearms Journal [2] |
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.300 Winchester Magnum (known as .300 Win Mag or in metric countries as 7.62 x 67 mm) is a popular magnum rifle cartridge that was introduced by Winchester Repeating Arms Company in 1963 as a member of the family of Winchester Magnum cartridges. It is an accurate, long-range round with a relatively flat trajectory.
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[edit] Performance
The .300 Win Mag is a cartridge for large game hunting and long range shooting. It sees use in long range benchrest competition and has been adopted by Law Enforcement Marksman and by a few specific branches of the US Military for use by their snipers. Maximum effective range is generally accepted to be 1210 yards (1097 m) with ammunition incorporating low drag projectiles. Sub 1 minute-of-angle (MOA) accuracy out to 1000 yards (914 m) is not unusual in precision built rifles firing match grade ammunition. Velocity with a 180 grain projectile at max powder charge and 24" barrel is 2975 ft/s ±25 ft/s (907m/s ±7.6m/s).
Recoil from the .300 Win Mag is strong, much more than the .30-06 Springfield. Remington has made low-recoil rounds called "Managed-Recoil" available, that kick less and provide performance similar to the .300 Savage.[2]
[edit] Other information
Like the other members of Winchester Magnum family, the cartridge is based on a shortened version of the H&H casing.[3]
The .300 Win Mag remains the most popular .30 caliber magnum with American hunters, despite being eclipsed in performance by the more powerful .300 Weatherby Magnum and newer .300 Remington Ultra Magnum.[2] It is a popular selection for hunting Elk, because it delivers longer range performance than non-magnum .30 caliber cartridges.
