The .300 Winchester Magnum appeared in 1963 when Winchester firearms and Winchester-Western Ammunition were parts of the same company. The year is considered a fateful one by most Winchester fans, because it was the last year the “pre-’64” Model 70 was produced. In 1964 the rifle was changed in several ways to make it more profitable (Winchester had been losing on every Model 70 sold for several years), but their rejuvenation plan didn’t work, because few shooters liked the new Model 70.

Some didn’t like the new cartridge either, especially older shooters who hated the relatively short case neck, mostly because it meant heavier bullets “intruded” into the powder space. This supposedly cut into the new round’s ballistic potential, though in reality powder space is powder space, even when it occurs around a bullet’s base. Apparently the same shooters hadn’t noticed heavier bullets also protruded well below the long neck of the .300 Weatherby Magnum.

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