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A 7mm-08 load with a more efficient 150-grain Nosler Partition at 2,700 ft/s (820 m/s) MV retains 1,790 fpe at 200 yards and 1,525 fpe at 300. [27] Careful handloading with a bullet of higher BC should restore the gain the 270 Win. brings through its larger case.
These Nosler Partition bullets used a specially designed jacket enclosing two separate lead alloy cores. [1] The front core was open on the nose to expand easily, but expansion would stop at the partition (which was a solid layer of copper extending right across the bullet, not just the thin shell of copper which composed the jacket).
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 RUM was created using the .404 Jeffery case [citation needed] which was also used to develop the .375 RUM.300 RUM, and .338 RUM [citation needed]. By necking down the .300 RUM to suit the .284 or 7mm projectile, Remington produced a non-belted case with a head diameter that is somewhat larger than the belt diameter of the original ...
For whitetails, the 120-grain Nosler is an excellent performer, but when greater penetration is needed for Mule Deer and Black Bear, the 139-grain Hornady is a better choice." [14] Nosler and Hornady no longer offer flat nose bullets in 7mm. [15] [16]
One of P.O. Ackley's earliest wildcats was the 7mm-06 Improved, which was made by necking down the .30-06 Springfield case and fire-forming it to have less body taper and a 40-degree shoulder angle. Soon after the .280 Remington came out, Fred Huntington reformed its case to an improved configuration with minimum body taper, a 35-degree ...
7mm-RPC (wildcat) 7mm SAUM neck location 30° shoulder .308 Brass, "7mm Rum Punch Colonial". Wild Monkey; 7mm-08 Remington; 7mm Winchester Short Magnum; 7mm Remington Short Action Ultra Magnum.308 Winchester – considered interchangeable with 7.62×51mm NATO according to SAAMI. 7.62x51 NATO - Original cartridge.300 Winchester Short Magnum
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 ...