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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 Remington Bench Rest case shares the same case head dimensions (0.470"/ 11.94mm) as the commercial .308 Winchester (as well as other cartridges based on that case; .243 Winchester, .260 Remington, 7mm-08 Remington, etc.) and military 7.62×51 NATO cartridges.
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]
An overview of 7mm caliber cartridges, their history, and uses in firearms.
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).
7 mm Remington cartridges are all rifle cartridges with bullets of 7 millimetres (0.28 in) diameter developed and sold by Remington.. These cartridges include: .280 Remington (7mm Express Remington)
The 7mm Weatherby Magnum is a very adequate cartridge for hunting medium to large-sized deer such as mule deer, wapiti and moose, up to long ranges due to its plain trajectory with bullets of different weights and due to the high ballistic coefficient the 7mm bullets are praised for.
The 7mm-08 with 139-140 grain loads does well against some 150-grain .308 Win. loads, providing good energy levels. One example is the Remington 7mm-08 140 PSP (1490 fpe at 300 yards) compared with the Remington 308 150 grain PSP (1344 fpe at 300 yards). [14] The 7mm-08 invites a ballistic comparison with the veteran, highly esteemed 7×57mm ...