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. As Reloading Solutions Limited has no control over improper storage, handling, loading or use of Vihtavuori powders after they have left our facility, we make no warranty of any kind, either expressed or implied, limited or full. We specifically disclaim all warranties of fitness for a particular purpose and merchantability. We specifically disclaim all liability for consequential damages of any kind whatsoever, whether or not due to seller’s negligence or based on strict product liability or principle of indemnity or contribution, Reloading Solutions Limited neither assumes nor authorises any person to assume for it any liability in connection with the use of this product.
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