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An overview of 7mm caliber cartridges, their history, and uses in firearms.
The 7mm Backcountry is a modern rifle cartridge using cartridge cases of a proprietary steel alloy able to withstand higher pressures than traditional brass alloys. The objective is to obtain higher muzzle velocities from short-barreled rifles which are lighter and easier to carry than 20th-century rifles intended for long range shooting . [ 1 ]
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.
Common rifle cartridges, from the largest .50 BMG to the smallest .22 Long Rifle with a $1 United States dollar bill in the background as a reference point.. This is a table of selected pistol/submachine gun and rifle/machine gun cartridges by common name.
.450 Dakota.450 Watts Magnum.458×2-inch American.458 Express.458 HAM'R.458 Lott.458 SOCOM.458 U.S. Silent Sniper.458 Winchester Magnum.460 Steyr.460 Weatherby Magnum.461 Gibbs.465 H&H Magnum.500/465 Nitro Express.470 Nitro Express.475 Nitro Express.475 No 2 Nitro Express.476 Nitro Express.499 Leitner-Wise
Some common commercial children of the .404 Jeffery case are the Remington Ultra Magnum (RUM) cartridge family, which in turn spawned the Remington Short Action Ultra Magnum (RSAUM) cartridges. Also, the Winchester Short Magnum (WSM) and the Winchester Super Short Magnum (WSSM) families are believed to derive from the 404 Jeffery case.
Whereas the 7mm RUM case measures 60.6 mm (2.387 in) long from head to body-shoulder juncture, that dimension on the .28 Nosler case is 55.0 mm (2.166 in). The dimension at that point on the .28 Nosler case is 0.051 mm (0.002 in) larger, and that reduces its body taper by just a tad.
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.