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The .300 H&H (Holland & Holland) Magnum Cartridge: Its History

The .300 H&H (Holland & Holland) Magnum's tapered shoulder and belted base set the stage for later .30-caliber Magnums; here's its history.

The .300 H&H (Holland & Holland) Magnum Cartridge: Its History

Based on the .375 H&H (right), the 101-year-old .300 H&H (center) easily beat the performance of the .30-06 (left), and it’s still a fine hunting cartridge.

In 1912 the respected British firm Holland & Holland established the future of the belted rifle case with the .375 H&H Magnum. It was not the first belted case, but it was the one that set the dimensions for a century of cartridges to come. H&H’s head and belt design have been used almost unchanged in a staggering number of standard, proprietary, and wildcat cartridges.

In about 1920, H&H applied those head dimensions to a then-new .30-caliber cartridge, first called the “Holland’s Super 30.” The same length as the .375 H&H case, the newcomer had a long, tapered shoulder. Soon its standardized name became the .300 H&H Magnum, and...

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