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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.
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Since Winchester was already manufacturing the belted magnum case, it was the logical choice to develop new cartridges during that era.
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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. They are good cheap plinker bullets to shoot up.Many people expected Winchester to neck down the. If burning $$$ on accubonds seems painful during load development, you can try sierra gamekings in the same weight. Powders can be found off and on from several local sources, I've was able to buy 7828 just a couple weeks ago from Scheels. but mag rifle are easier to find than say, small rifle / small pistol. Reloading supples are very hard to come by. Good luck rounding up a box of 180 Accubonds though. I tried RL22, RL25, H1000 etc etc, but 7828 was the winner for my gun. 7828 is a very nice powder for big magnums (Its my most accurate reloaded round out of my 7MM STW, 3200 fps with 160gr Accubonds). That should give you an indication of what your gun likes. You can ask folk what powders work best for that weight of bullet in that caliber and start with that. Try at least 3 powder amounts from low med and 10% under max for each powder. Then you can try various powers to see what your gun likes. Buy the bullet you most want to use, as Critter said they come 50 per box.
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