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 .300 H&H Ammo

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The .300 H&H ammo was introduced by the British company Holland & Holland as the Super-Thirty in June 1925. The cartridge was used by American shooter Ben Comfort to win the 1000-yard Wimbledon Cup Match at Camp Perry in 1935, and it used again to win the international 1,000-yard competition in 1937.


Parent case .375 H&H Magnum

Bullet diameter .308 in (7.8 mm)

Neck diameter .338 in (8.6 mm)

Shoulder diameter .450 in (11.4 mm)

Base diameter .513 in (13.0 mm)

Rim diameter .532 in (13.5 mm)

Rim thickness .220 in (5.6 mm)

Case length 2.850 in (72.4 mm)

Overall length 3.600 in (91.4 mm)

Rifling twist 1-10"

Primer type large rifle magnum

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