FANDOM


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| .300 H&H Magnum Type Rifle Place of origin Flag of the United Kingdom United Kingdom
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| Production history Designer Holland & Holland Designed 1920 Manufacturer Holland & Holland Produced 1920 colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Specifications Parent case .375 H&H Magnum Bullet diameter .309 in (Expression error: Unexpected < operator.
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 mm
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Neck diameter .338 in (Expression error: Unexpected < operator.
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 mm
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Shoulder diameter .450 in (Expression error: Unexpected < operator.
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 mm
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Base diameter .513 in (Expression error: Unexpected < operator.
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 mm
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Rim diameter .532 in (Expression error: Unexpected < operator.
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 mm
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Rim thickness .220 in (Expression error: Unexpected < operator.
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 mm
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Case length 2.850 in (Expression error: Unexpected < operator.
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 mm
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Overall length 3.600 in (Expression error: Unexpected < operator.
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 mm
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Rifling twist 1-10" Primer type large rifle magnum colspan="3" style="background: lightsteelblue; text-align: center; vertical-align: middle;"
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| Ballistic performance Bullet weight/type Velocity Energy style="vertical-align:middle; border-bottom: 1px dotted #aaa;
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" | 150 gr (Expression error: Unexpected < operator.
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" | 165 gr (Expression error: Unexpected < operator.
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" | 180 gr (Expression error: Unexpected < operator.
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Test barrel length: 26"
Source: Reloading data at Accurate Powder

The .300 Holland and Holland Magnum Cartridge first became available in 1925.[1] The case was belted like the .375 H&H Magnum, and is based on the same case, as also 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 won the international 1,000 yard competition in 1937, and Winchester Repeating Arms Company chambered the Model 70 in .300 H&H in 1939.[1]

The .300 H&H has what is referred to as the "H&H mystique". It is surprisingly soft-shooting, with a whoosh rather than the abrupt recoil and crack of the .30-06. Ballistically similar to a beefed-up .30-06, the .300 H&H is just 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.[1] Its case length calls for a full-length magnum action, longer than for the .30-06. It is not nearly as popular as the .30-'06, and never was; but because of its mystique the .300 H&H keeps hanging on despite its repeatedly reported demise. The .300 H&H is an exceptionally fine African plains game cartridge, and suitable for all but the most dangerous big game and pachyderms.

CategoriesEdit

Cartridge:rifles
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