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Ammo Brief: 7mm Weatherby Magnum
Guns and Gear

Ammo Brief: 7mm Weatherby Magnum

Jimmie Dempsey
Last updated: February 7, 2025 1:16 pm
Jimmie Dempsey Published February 7, 2025
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Here we take a quick look at 7mm Weatherby Magnum, an unfortunate victim of the 7mm Remington Magnum.

The 7mm Weatherby Magnum was developed in 1944 as one of a series of cartridges based on the necked-down .300 H&H case (it is the .270 WM necked up .007 inch, although it does use a longer overall cartridge length). There are several similar wildcat versions, but Weatherby’s design is the most popular, due to the availability of commercial ammunition.

The 7mm (or .284-caliber) has long been popular in the United States in various wildcat cartridges, yet the original 7mm Mauser never generated any great enthusiasm. The 7mm Weatherby Magnum, offered as a maximum-performance cartridge, is probably the best known and most widely used of the current 7mm Magnums, with the single exception of the 7mm Remington Magnum. This is due in part to the availability of factory-loaded ammunition in a good selection of bullet weights.

The 7mm Weatherby has a slight edge over the .270 Weatherby on tough or dangerous game because it can use heavier bullets and churns up greater energy. However, if long-range varmint shooting is on the agenda, the .270 is the better choice. The 7mm Weatherby Magnum is adequate for any North American big game and all thin-skinned African game. The 7mm Weatherby Magnum has, to a large extent, lost popularity to the 7mm Remington Magnum, because the Remington version is available in a wider variety of rifles that are generally less expensive than the Weatherbys.

Like most high-intensity cartridges, the 7mm WM can be somewhat hard on its barrel, especially with either careless shooting, inadequate barrel cooling between shots, or inadequate barrel cleaning. And, like all similar chamberings, it loses significant velocity with barrels shorter than 24 inches. Ammunition for this cartridge is now available from Federal and Norma, as well as Weatherby.

7mm Weatherby Magnum Loading Data and Factory Ballistics

Bullet
(grains/type)
Powder Grains Velocity Energy Source
100 HP IMR4350 73.5 3,600 2,878 Hornady
115 HP IMR4831 76 3,600 3,310 Speer
120 SP IMR4350 70 3,400 3,081 Sierra, Nosler, Hornady
130 SP IMR4320 63 3,300 3,144 Speer
139 SP IMR4350 68 3,200 3,161 Sierra, Nosler, Hornady
154 SP IMR4350 67 3,100 3,287 Hornady
160 SP IMR4350 65 3,000 3,198 Sierra, Speer
175 SP IMR4350 65 2,800 3,047 Speer, Hornady
195 SP IMR7828 61 2,500 2,707 Speer
140 Barnes TSX FL – 3,250 3,284 Weatherby B7MM140TTSX
160 Speer Trophy Bonded FL – 3,100 3,414 Federal P7WBTT1
170 Oryx JSP FL – 2,985 3,364 Norma 20171072
175 JSP FL – 3,070 3,662 Weatherby H7MM175SP

Editor’s Note: This article is an excerpt of Gun Digest’s Cartridge’s Of The World.


More On Rifle Ammo:

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