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The difference in velocity between the 7mm SAUM cartridge and the 7mm Winchester Short Magnum (WSM) is less than 50 feet per second; they are almost ballistic twins. Both the 7mm SAUM and the 7mm WSM achieve optimal ballistic results when using bullet weights from 120 to 160 grains.
7 mm Remington cartridges are all rifle cartridges with bullets of 7 millimetres (0.28 in) diameter developed and sold by Remington. These cartridges include: .280 Remington (7mm Express Remington) 7mm BR Remington (Bench Rest) 7mm Remington Magnum; 7mm Remington Ultra Magnum (RUM) 7mm Remington Short Action Ultra Magnum (SAUM) 7mm-08 Remington
7mm Remington Ultra Magnum; Type: Rifle: Place of origin: United States: Production history; Designer: Remington: Designed: 2002: Specifications; Parent case.300 ...
Components of a modern bottleneck rifle cartridge. Top-to-bottom: Copper-jacketed bullet, smokeless powder granules, rimless brass case, Boxer primer.. Handloading, or reloading, is the practice of making firearm cartridges by manually assembling the individual components (metallic/polymer case, primer, propellant and projectile), rather than purchasing mass-assembled, factory-loaded ...
Source(s): Accurate Powder [1] The 7mm Remington Magnum rifle cartridge was introduced as a commercially available round in 1962, [ 2 ] along with the new Remington Model 700 bolt-action rifle . It is a member of the belted magnum family that is directly derived from the venerable .375 H&H Magnum . [ 3 ]
Winchester claims a muzzle velocity (MV) of 3,225 ft/s with a 140 grain bullet for their 7mm WSM cartridge; the claimed muzzle energy (ME) is 3,233 ft. lbs. With a 160 grain bullet the Winchester figures are 2990 ft/s and 3176 ft. lbs. at the muzzle. The lighter, shorter 7mm bullets are preferred in these short case magnums. [2]
It was one of the original short, fat magnum cartridges to be put into production. The short, fat cartridge design is known to promote efficient powder burning characteristics. The SAAMI recommends a 6 groove barrel with a 1:9 twist. The bore diameter is given as .256-inch (6.5 mm) and the groove diameter is .264-inch (6.7 mm).
Lazzeroni's short magnums (7.21 Lazzeroni Tomahawk) were designed to operate in a short-action rifle, instead of requiring a long action. The U.S. Repeating Arms Company was the first major manufacturer to commercialize Lazzeroni's concept, followed shortly thereafter by Remington with their "Short Action Ultra Mag" line.