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The principle at work in the short magnum cartridge is the fitting of larger volumes of powder in closer proximity to the primer's flash hole, resulting in more-uniform ignition. .300 WSM has a case capacity of 80 grains. The .30-06 Springfield holds 69 grains; .308 Winchester holds 56 grains; 30-30 Winchester holds 45 grains.
For example, if we compare the .25 WSSM to the .25-06 Remington, we find that the .25-06 requires a .30-06 length action, commonly called a standard or long action. The .25 WSSM case which is almost a full inch shorter, can make use of an existing short action such as used by the 5.56 NATO and .223 Remington family of cartridges.
.30 Carbine.30 Newton.30 Nosler.30 R Blaser.30 Remington.30 Remington AR.30 TC.30-01 ... Reloading information at Load Data; Cartridge diagrams at Steve's Pages;
A guide to the recoil from the cartridge, and an indicator of bullet penetration potential. The .30-06 Springfield (at 2.064 lbf-s) is considered the upper limit for tolerable recoil for inexperienced rifle shooters. [2] Chg: Propellant charge, in grains; Dia: Bullet diameter, in inches; BC: Ballistic coefficient, G1 model; L: Case length (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.
When firing a 9.7 g (150 gr) AccuBond Long Range bullet from a rifle with a 660 mm (26 in) barrel, the .27 Nosler has an approximately 120 m/s (400 ft/s) advantage over the .270 Winchester, about a 90 m/s (300 ft/s) advantage over the .270 WSM, and about a 30–46 m/s (100–150 ft/s) velocity advantage over the .270 Weatherby. The primary use ...
The .30-06 Springfield and .308 Winchester cartridges also offer several high-BC loads, although the bullet weights are on the heavy side for the available case capacity, and thus are velocity limited by the maximum allowable pressure.
The WSM case was designed to be loaded with .30 calibre (7.62mm) bullets. An aspect of the short, fat cartridge design is that it has a narrower acceptable calibre range than a longer cartridge case. It was for this reason that Winchester introduced the WSSM cartridge case to load sub .27 calibre (6.8mm) bullets.