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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 ]
An overview of 7mm caliber cartridges, their history, and uses in firearms.
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]
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).
The rifle is chambered for the .308 Winchester cartridge as well as the .223 Remington, .243 Winchester, 7mm Remington Magnum, .300 Winchester Magnum, .300 Remington Ultra Magnum and .338 Lapua Magnum. The 700P has a 26" barrel and aluminum block bedding in its stock made by HS Precision.
Weatherby's early 7mm rifles were manufactured with 1:12" barrels, which were too slow to stabilize the heavier bullets. Once the 7mm Rem Mag was introduced, manufactured with 1:9 1/4" barrels, Roy Weatherby decided to modify the twist for a 1:10. [3] Weatherby Mark V in 7mm Weatherby
Compared to the 7mm Remington Magnum, top 7mm RUM loads deliver 25% more energy at 300 yards. [citation needed] Such performance demands a price and in this case, that is a large muzzle blast, sharp recoil and short barrel life. [1] The 7mm Ultra Magnum boasts the largest case of any commercial 7mm cartridge.