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The 7mm-08 Remington is a rifle cartridge that is almost a direct copy of a wildcat cartridge developed around 1958 known as the 7mm/308. As these names would suggest, it is the .308 Winchester case necked down to accept 7 mm (.284) bullets with a small increase in case length.
The 7mm Shooting Times Westerner, sometimes referred to as the 7mm STW, began as a wildcat rifle cartridge developed by Layne Simpson, Field Editor of Shooting Times, in 1979. [3] It is an 8mm Remington Magnum case that has been "necked down" (narrowing the case opening) by 1 mm to accept 7 mm (.284 in) bullets. [4]
Currently 7mm SAUM is experiencing a rebound in popularity with custom rifle builders and handloaders, as it is able to drive the long (180 grain class) bullets fast enough for long range target shooting. The 7mm SAUM is a popular choice in f-class shooting, and has been used to take home multiple championships in this discipline.
For handgun cartridges, with heavy bullets and light powder charges (a 9×19mm, for example, might use 5 grains (320 mg) of powder, and a 115 grains (7.5 g) bullet), the powder recoil is not a significant force; for a rifle cartridge (a .22-250 Remington, using 40 grains (2.6 g) of powder and a 40 grains (2.6 g) bullet), the powder can be the ...
The length of the barrel (especially for larger guns) is often quoted in multiples of the caliber, used, for example, in US naval rifles 3 in (76 mm) or larger. [2] The effective length of the barrel (from breech to muzzle) is divided by the barrel diameter to give a dimensionless quantity.
Miller twist rule is a mathematical formula derived by American physical chemist and historian of science Donald G. Miller (1927-2012) to determine the rate of twist to apply to a given bullet to provide optimum stability using a rifled barrel. [1]
Rifle: Place of origin: United States: Production history; Designer: Remington: Designed: 2002: Specifications; Parent case.300 Remington Ultra Magnum: Case type: Beltless, rebated, bottleneck: Bullet diameter.284 in (7.2 mm) Neck diameter.317 in (8.1 mm) Shoulder diameter.5250 in (13.34 mm) Base diameter.5500 in (13.97 mm) Rim diameter.532 in ...
= barrel bore cross section area (in cm 2 or in 2) The higher the O ratio result, the more overbore a cartridge will be. As the ratio is expressed in units of length, relatively high O ratio is a good predictor of suitability for relatively long barreled guns.