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The 7mm SAUM is a popular choice in f-class shooting, and has been used to take home multiple championships in this discipline. [ 2 ] [ 3 ] The 7mm Short Action Ultra Magnum cartridge (7mmx51) is a different cartridge than the similarly named 7mm Ultra Magnum (7mmx72).
7mm Remington Ultra Magnum; Type: Rifle: Place of origin: United States: Production history; Designer: Remington: Designed: 2002: Specifications; Parent case.300 ...
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).
Source(s): Reloading data at Accurate Powder .300 Remington Short Action Ultra Magnum (also known as 300 RSAUM, 300 RSUM or 300 Rem SAUM) is a .30 caliber short magnum cartridge that is a shortened version of the Remington 300 Ultra Mag, both of which derive from the .404 Jeffery case.
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 ]
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 ...
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.
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]