| .244 H&H Magnum |
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| Type | Rifle |
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| Place of origin | United Kingdom |
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| Designer | David Lloyd |
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| Designed | 1955 |
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| Manufacturer | Holland & Holland |
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| Produced | 1955–present |
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| Parent case | .375 H&H Magnum |
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| Case type | Belted, bottleneck |
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| Bullet diameter | .245 in (6.2 mm) |
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| Land diameter | .237 in (6.0 mm) |
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| Neck diameter | .263 in (6.7 mm) |
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| Shoulder diameter | .445 in (11.3 mm) |
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| Base diameter | .508 in (12.9 mm) |
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| Rim diameter | .532 in (13.5 mm) |
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| Case length | 2.78 in (71 mm) |
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| Overall length | 3.58 in (91 mm) |
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| Bullet mass/type |
Velocity |
Energy |
| 100 gr (6 g) SP |
3,500 ft/s (1,100 m/s) |
2,720 ft⋅lbf (3,690 J) |
|
| Source(s): Cartridges of the World |
The .244 Holland & Holland Magnum cartridge was created in 1955 in Great Britain by deerstalker and rifle-maker David Lloyd of Pipewell Hall, Northamptonshire and Glencassley in Sutherland, Scotland, and is not to be confused with the smaller-cased and much milder 6 mm (.244 in) Remington. Stalking on extremely steep deer forests such as his own at Glencassley, Lloyd was in search of a "canyon rifle" cartridge that would shoot exceptionally fast and with a very flat trajectory across deep valleys and over distances out to 300 yards (270 m) and more, to make range estimation less critical for accurate bullet placement, and to deliver a hard-hitting bullet weighing a minimum of 100 grains. The .244 H&H Magnum easily met these criteria.
