Winchester Magnum refers to a "family" of cartridges developed by the Winchester Repeating Arms Company [1] (http://www.winchesterguns.com/), one of the oldest firearms manufacturers in the United States, in the late 1950's and early 1960's, all based on the same basic cartridge case. The basic case was a "short" magnum, meaning it would work through a standard (i.e.; 30-06) length rifle action rather than requiring the longer, magnum (i.e. .375 Holland and Holland) actions.
The dimensions of the basic case are:
Outside diameter (at base) - .532 in. (13.51 mm)
Inside diameter (of case) - .490 in. (12.47 mm)
Maximum case length - 2.62 in. (66.55 mm)
The cartridges in this family are, in the order of development:
.458 Winchester Magnum (1956) - .458 in. (11.658 mm) bullet
.338 Winchester Magnum (1958) - .338 in. ( 8.610 mm) bullet
.264 Winchester Magnum (1959) - .264 in. ( 6.500 mm) bullet
.300 Winchester Magnum (1963) - .308 in. ( 7.620 mm) bullet
With the exception of the .264, all of these cartridges are still widely used. The .458 has become the #1 cartridge for dangerous game in Africa, as well as a very popular round with Alaskan/Canadian bear guides. The .338 is widely used for game ranging from elk and African plains game to truly dangerous game such as grizzly/brown bears and African lions. The .300 is one of the most popular cartridges in the world, used for everything from deer to brown bears.
The.264 WinchesterMagnum was one of a series of short belted magnums developed by winchester, it was officially introduced to the public in 1959 by winchester.
The 264 winchestermagnum is an excellent, accurate, and flat shooting cartridge that is capable of taking any game in the lower 48 states and is one of the more powerful 26 caliber cartridges, when loaded with 140 grain bullets at 3100 fps.
The 264 winchestermagnum when loaded with 129 grain bullets recoil is quite minimal and controllable when loaded with 140 grain bullets the recoil increases quite a bit, a good recoil pad fitted to the rifle will tame the recoil before it gets to your shoulder.
Winchester’s Supreme line of handgun ammunition is offered in a number of fine hunting cartridges that include the 357 Magnum, 41 and 44 Remington Magnums, 45 WinchesterMagnum, and the awesome 454 Casull.
The 41 magnum from my Smith and Wesson 657 with a 4x scope and the 44 magnum from my Ruger Super Blackhawk Hunter wearing a 2x scope, both scopes were Leupold EER Another round included in these test is the 45-70 Government.
Winchester markets these rounds as suitable for thin-skinned game such as White-tailed deer and wild hogs and I believe they are right on with this recommendation.