7 mm STW

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The 7 mm STW (Shooting Times Westerner) began as a wildcat rifle cartridge developed by Layne Simpson. It is an 8 mm Remington Magnum case that has been "necked down" (narrowing the case opening) by 1 mm to accept 7 mm (.284 in) bullets. The Remington company has released commercial ammunition in this cartridge since 1997, and all mass-market US riflemakers now offer a selection of production models chambered for the 7mm STW, which has established a reputation as a fine long-range deer and medium game rifle. (Dimensionally and ballistically, there are close similarities between the 7mm STW and the 6mm cartridge based on the .375 H&H Magnum case necked down, known as the .244 H&H Magnum.)

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