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The larger dimensions of the .300 Win Mag compared to the .308 Norma Magnum and .30-338 Winchester Magnum cartridges ensures that rifles chambered in such rounds can readily be rechambered to the .300 Win Mag, though the shorter neck of the longer round necessitates comparable bullets must be seated more deeply in the case.
The .300 WSM also head-spaces off of the case shoulder, versus the older .300 Winchester Magnum's belted head space design. The advantage to this round is the ballistic performance is nearly identical to the .300 Winchester Magnum [ 2 ] in a lighter rifle with a shorter action burning 8 - 10% less gunpowder.
Due to the gaining popularity of the 7mm Rem Mag, in 1963 Winchester launches the last member of the Winchester Magnum family of cartridges; the .300 Winchester Magnum; a standard length action belted magnum driving a 180 grain bullet at 3000 fps and a 150 grain bullet at a muzzle velocity of 3300 fps. The cartridge took off slowly but managed ...
A magnum cartridge is a firearm cartridge with a larger case size than, or derived from, ... .300 Winchester Magnum.30-378 Weatherby Magnum.308 Norma Magnum;
Official size (mm) MV ... .300 Winchester Magnum: ... rebated rim cartridge developed by Remington Arms by necking up the .300 Remington Ultra Magnum case. .375 ...
Like most of his other magnum cartridges, this is based on a blown-out .300 H&H Magnum case, using the signature Weatherby double-radius shoulder. The Weatherby was first introduced in 1944, and the .300 Winchester Magnum was introduced in 1963.
Rebating the rim to 13.6 mm (0.534 in) simplifies the production of rifle bolts since the rims of Holland & Holland-style belted magnums, such as the 7mm Remington Magnum and .300 Winchester Magnum, are the same diameter. Whereas the 7mm RUM case measures 60.6 mm (2.387 in) long from head to body-shoulder juncture, that dimension on the .28 ...
The 300 WSM was the first of the new class of short magnums to see wide use. All of the WSM cartridges released to date have proven popular for thin-skinned game up to the size of elk and African plains game, the .325 WSM being an excellent cartridge for elk, bison and similar big game.