Vihtavuori Load Data - 300 H&H Magnum
The .300 H&H Magnum cartridge was introduced by the British company Holland & Holland as the Super-Thirty in June 1925. The case incorporated a belt like the .375 H&H Magnum, and is based on the same case, as is the .244 H&H Magnum. The belt is for headspace as the cases' shoulders have a narrow slope rather than an actual shoulder. More modern magnums continue this practice, but headspacing on the belt is not necessary with their more sharply angled shoulders.
The cartridge offered superior ballistics to the .30-06 for long range, and the .300 H&H is almost as versatile with all bullet weights and types, especially if well-developed handloads are used. It excels with the heaviest .30-calibre bullets in the 180–220-grain range. SAAMI has set the pressure limit for this cartridge at 54,000 P.S.I.
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