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An overview of 7mm caliber cartridges, their history, and uses in firearms.
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.
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.
12 kg w/o scope: Length: 1420 mm: Barrel length: 1000 mm: Cartridge: 12.7×108mm ... or Degtyarev sniper rifle is a 12.7mm anti-materiel rifle developed in Russia for ...
Winchester claims a muzzle velocity (MV) of 3,225 ft/s with a 140 grain bullet for their 7mm WSM cartridge; the claimed muzzle energy (ME) is 3,233 ft. lbs. With a 160 grain bullet the Winchester figures are 2990 ft/s and 3176 ft. lbs. at the muzzle. The lighter, shorter 7mm bullets are preferred in these short case magnums. [2]
The Raufoss Mk 211 is a .50 BMG (12.7×99mm NATO) multi-purpose anti-material high-explosive incendiary/armor-piercing ammunition projectile produced by Nammo under the model name NM140 MP. [1] It is commonly referred to as multipurpose or Raufoss , meaning red waterfall in Norwegian.
The barrel of the Hécate is manufactured by FN Herstal and is lined with Stellite alloy which is also used for large calibre machine guns. This increases the barrel's longevity. [ 2 ] It is fitted with a high-efficiency muzzle brake which reduces the felt recoil to about the level expected of a 7.62×51mm NATO -chambered rifle. [ 3 ]
The low demand for factory ammunition in 7mm SAUM has resulted in a sharp increase in the cost of 7mm SAUM as of mid 2014. 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.