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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 ]
This is a list of firearm cartridges which have bullets in the 7.00 to 7.99 millimetres (0.2756 to 0.3146 in) caliber range. Length refers to the cartridge case length. OAL refers to the overall length of the cartridge.
Western produced 3 billion rounds of ammunition in World War II, and the Winchester subsidiary developed the U.S. M1 carbine and produced the carbine and the M1 rifle during the war. Western ranked 35th among United States corporations in the value of wartime production contracts. [10] Cartridges made by Western are stamped WCC.
Bullets had the manufacturer code over the Quarter number and two-digit year of production engraved on the base (e.g. Pk/2-26 is Zaklady Amunicyjne, Pocisk, 2nd Quarter of 1926). 8mm Lebel "Balle D" bullets were differenced from 7.9mm Mauser bullets by a capital letter "D" inset between the contractor code and the date (e.g. Pk/D/2-26).
A typical .30-30 factory load fires a 150-grain bullet at 2390 ft/s, while the current 7-30 factory load fires a 120-grain bullet at 2700 ft/s. Muzzle energy is just over 1900 ft-lbs for both of these loads, but the lighter weight 7 mm bullet has a higher velocity and flatter trajectory.
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]
There are also two little-known cartridges of the Whisper Family based on handgun cartridge cases. These are the 7.62 Micro Whisper, based on the .30 Luger case; and the 7.63 Mini-Whisper, based on the .30 Mauser case. Like the rest of the Whisper Family, these two cartridges are designed to fire rifle bullets at subsonic velocities.