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Data last updated on 2020-09-28 @ 12:13:17pm(EST)

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.300 Win Mag

Search In-Stock .300 WIN MAG Ammo For Sale - Inexpensive Price from Top Ammo Retailers

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


  • 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)

Shop for .300 WIN MAG Ammo from top ammo retailers at Bulk Cheap Ammo. A one-stop place for all ammo needs from top retailers.

Bulk Cheap Ammo gives the best deals to gun lovers at competitive prices from top retailers. All the ammunition products you will see on our website are in stock. We help the gun owner to provide them their favorite ammo on a single page at the best price.

Here at Bulk Cheap Ammo, our main aim is to help gun owners to find in stock ammo in one place form top retailers and get the best deals on your favorite ammo. We are the best ammo directory where you can find competitive prices on bulk ammo and cheap ammo.

We offer easy to search navigation by Brands, Calibers, Grains, by UPC, Number of Rounds & other advanced search options. 

Whether you are looking.300 WIN MAG Ammo for target shooting or personal shooting, we have it all in one place.

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ATTENTION: The following locations have ammunition restrictions.

California - Retailer must ship to FFL.

Connecticut - Retailer must have your ACE or Pistol Permit and State ID on file or ship directly to and FFL.

Illinois - Retailer must have your FOID and State ID on file.

Illinois (Chicago) - Retailer must ship to an FFL.

Massachusetts - Retailer must have your ACE or Pistol Permit and State ID on file or ship directly to an FFL.

New York - Retailer must ship to an FFL.

New York (New York City) - No ammo shipments allowed.

New Jersey - A copy of your current Drivers License and Firearms Purchaser ID Card are required before a retailer can ship the order.

Please check local laws and shipping policy before placing an order.