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The .300 Winchester Magnum (also known as .300 Win Mag or 300WM) (7.62×67mm) is a belted, bottlenecked magnum rifle cartridge that was introduced by Winchester Repeating Arms Company in 1963. 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 is extremely versatile and has been adopted by a wide range of users including hunters, target shooters, military units, and law enforcement departments. Hunters found the cartridge to be an effective all-around choice with bullet options ranging from the flatter shooting 165 grain to the harder hitting 200+ grain selections available from the factory. The .300 Win Mag remains the most popular .30 caliber magnum with American hunters, despite being surpassed in performance by the more powerful .300 and .30-378 Weatherby Magnums and the newer .300 Remington Ultra Magnum. It is a popular selection for hunting moose, elk, and bighorn sheep as it can deliver better long range performance with better bullet weight than most other .30 caliber cartridges. Military and law enforcement departments adopted the cartridge for long range sniping and marksmanship. As a testament to its accuracy, since its introduction it has gone on to win several 1,000-yard (910 m) competitions.

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  1. ddjchemist

    Spent cases won't fit back into the same rifle (Tikka T3X 300 WM)

    I am getting into reloading and learning a lot about it. I started a separate tread about it and many people replied to my tread and I highly appreciate all the help and advise from this wonderful firearm community (you are all my brothers and sisters in arm). In the process, I learned that ammo...
  2. T

    Steel or Aluminum Rings/Bases for Weatherby 300 WM?

    To be placed on Weatherby Vanguard S2. Talley makes Aluminum Rings and Bases in one unit, but I am wondering for long term durability if the Aluminum Rings will stand up to the recoil? Any suggestions for Rings and Bases for this rifle?
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