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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 .30 Nosler shares the same overall cartridge length 84.8 mm (3.340 in) as the .26 Nosler and the .28 Nosler which allows it to be chambered in standard-length action firearms. Four of Nosler's Cartridges, the .26 Nosler, .28 Nosler, .30 Nosler, and .33 Nosler, are based on the same .300 Remington Ultra Magnum [6] parent case.
Weatherby no longer loads the 250gr. round-nose cartridge pictured but continues to load the 250 gr. Spire Point and 250 gr. Nosler Partition. Weatherby has also expanded their factory loads including Nosler Ballistic-tip and Barnes TSX bullets complementing the powerful cartridge. [ 7 ]
The .257 Weatherby Magnum is capable of firing a 115 gr (7.5 g) Nosler Ballistic Tip bullet at 3,400 ft/s (1,036 m/s) generating 2,952 ft⋅lbf (4,002 J) of energy [3] which is comparable to factory loadings of the .30-06 Springfield and the .35 Whelen in terms of energy.
Nosler Partition or even the 250gr partition the .338-06 can handle the largest North America game including moose and brown bear. Rifles chambered in .338-06 need not be as heavy as a .338 Winchester Magnum or other .338 magnums; therefore, .338-06 chambered rifles are desirable for mountain hunting or where excessive weight is an issue.
The .300 Win Mag remains the most popular .30 caliber magnum with American hunters, despite not being as fast as more powerful .300 Magnums such as the .300 Weatherby Magnum and .30-378 Weatherby Magnum as well as the newer .300 Remington Ultra Magnum, .300 Norma Magnum, .30 Nosler, and .300 PRC, though all of these must be chambered in a long ...
Norma offers a solid and soft point ammunition loaded with Woodleigh 450 gr (29 g) bullets at 2,150 ft/s (660 m/s) in their PH line of ammunition. Remington offers a single load topped with a Swift A-Frame bullet while Winchester offers two loads in their Safari ammunition line using Nosler's Solid and Partition bullets.
Winchester currently offers ammunition in the traditional 510 gr (33 g) Soft Point and the new 500 gr (32 g) Nosler Partition and Nosler Solid. The Winchester 500 gr (32 g) loading has a muzzle velocity of 2,240 ft/s (680 m/s) and muzzle energy of 5,570 foot-pounds force (7,550 J).