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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.
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 ]
Care must be taken to confirm what twist rate was used, as the earlier West German 7mm Weatherbys used a 1-in-12 twist vs the faster 1-in-10 twist for those of later manufacture. The 1x12 twist rifles will not stabilize bullets over 150 grains, while the 1x10 twist rifles will stabilize bullets weighing up to 175 grains.
As is common with cartridges for double rifles, due to the need to regulate the two barrels to the same point of aim, the .275 No 2 Magnum was offered in one loading, firing a 140 gr (9.1 g) bullet with a listed speed of 2,675 ft/s (815 m/s).
Because changing the barrel of a gun to accommodate custom cartridges requires precision equipment, most wildcats are developed by or in association with custom barrel makers. Ammunition is handloaded, using modified parent cases and the gunsmith-provided wildcat dies. Generally, the supplier of the barrel or dies will also provide the buyer ...
7mm BR Remington; 7mm Penna; 7mm Remington cartridges; 7mm Remington Magnum; 7mm Remington Short Action Ultra Magnum; 7mm Remington Ultra Magnum; 7mm Shooting Times Westerner; 7mm Weatherby Magnum; 7mm Winchester Short Magnum; 7mm-08 Remington; 8 mm caliber; 8.5mm Mars; 8.6mm Blackout; 8×64mm S; 8×50mmR Mannlicher; 8×56mmR; 8×58mmR Danish ...
While pinfire rifles and shotguns began to decline in use from the early 1860s onward, after the introduction of mass-produced centerfire rifle and shotgun cartridges, pinfire revolvers in particular became very successful and widespread, being adopted by the armies of France, Italy, Spain, Switzerland, Sweden, and others.
Another example of an unsafe firearm and cartridge combination is the firing of saboted rounds in firearms with muzzle devices (such as a flash suppressor, muzzle brake, or choke) unless the muzzle device has been specifically designed for safe use with that particular type of saboted ammunition (see Saboted ammunition and muzzle devices below).