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The .275 No 2 Magnum's performance is comparable to the .275 Rigby. [ 1 ] 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).
An overview of 7mm caliber cartridges, their history, and uses in firearms.
T1IIJ = 110 cartridges .50 linked (API M8), 55 linked rounds per carton, 1 carton per M10 ammo can, 2 × M10 ammo cans per M12 wooden crate. Gross Weight: 44 lbs. Volume: 0.7 cubic feet. T1IIM = 110 cartridges .50 linked (4 × API M8, 1 × INC M1), 55 linked rounds per carton, 1 carton per M10 ammo can, 2 × M10 ammo cans per M12 wooden crate.
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 heaviest commercially loaded ammo available for the 7mm is 195 grains, [6] while the .30-06 Springfield can be loaded with bullets up to 220 grains, but for a .308 caliber to equal the flat trajectory and penetration of a .284 diameter 180-grain bullet with a muzzle velocity of 2,860 ft/sec (870 m/s), as offered for the 7mm Remington Magnum ...
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.
By design, fully jacketed projectiles have less capacity to expand after contact with the target than a hollow-point projectile or a soft-point projectile.While this can be an advantage when engaging targets behind cover, it can also be a disadvantage as an FMJ bullet may pierce completely through a target, leading to less severe wounding, and possibly failing to disable the target.
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.