30-06 length-bolt actions.Ĭritics were quick to point out that the comparatively short neck, measuring around. The latter was based on the same belted case and has an overall length of 3.340 inches to function in. 30-caliber magnums included (left to right): the. 30-06 length actions, while the shoulder angle is 25 degrees. Maximum overall cartridge length remained 3.340 inches to accommodate function in all. However, its shoulder was moved forward to increase powder capacity, the case neck shortened and the case length stretched from 2.500 to 2.620 inches. Design specifications were something of a surprise to many rifleman, as it was expected to be more or less identical to the. 300 Winchester Magnum in 1963 chambered in the pre-64 Model 70 rifle, with actual production only lasting a few months until the post-64 Model 70 appeared. Both of the above cartridges became relatively popular, but that was short lived. 308 Norma offered slightly greater powder capacity. 308 Norma in 1960 and even “loaned” reamers to gunsmiths wanting to convert an existing. 30-caliber belted magnum and introduced the. Norma recognized the value and widespread appeal of a. 30 caliber from Winchester, but when that didn’t happen immediately, they necked the. 30 caliber, which has been popular with U.S. However, loads developed with the ssc version may not allow charge weight duplication when using the long cut version.There was an obvious void in the new Winchester magnum cartridge lineup, as it lacked a. IMR-7828 and IMR-7828ssc share the same burn rate. Since Winchester was already manufacturing the belted magnum case, it was the logical choice to develop new cartridges during that era. 338 feature a 25-degree shoulder for positive headspace and the belt was not necessary. 458 is more or less a straight case and needed the belt for proper headspace control however, the. It is important to note that the belted magnum case was chosen because it offered the powder capacity to reach the desired performance, but also because Winchester was already making cases and retooling would have been costly. By comparison, they were “short action” magnums. 300/.375 H&H belted case, shortened to function in a standard length (3.340-inch) Each of the above cartridges is based on the.
With a booming post-war economy, during the 1950s Winchester began developing new cartridges such as the. Like the H&H, the Weatherby cartridge required a long, 3.600-inch magnum action.
During World War II, Roy Weatherby sought to improve its ballistics and blew the case out to significantly increase the powder capacity, which became the. and established a superb reputation as a general purpose big-game cartridge. 300 H&H became widely popular in the U.S. As a result, its fame soared and within months Winchester announced the brand new Model 70 rifle along with that caliber as a standard offering and began producing ammunition domestically. shooters however, in 1935 Ben Comfort won the prestigious 1,000-yard Wimbledon Cup with a custom rifle so chambered. 300 H&H had an overall length of around 3.600 inches and could not be housed in most. 300 Winchester Magnum.ĭue to the long sloping case, the belt was necessary to provide positive headspace control. However, Winchester chose to move the shoulder forward and increase powder capacity.
338 Winchester Magnum case to create its. Many people expected Winchester to neck down the.