.270 Weatherby Magnum
The .270 Weatherby Magnum was the first belted magnum based on the .300 H&H Magnum to be developed by Roy Weatherby in 1943. The cartridge is short enough to function in standard-length long actions with a brass length of 2.549" or 64.74mm and an overall length of about 3.295".
| .270 Weatherby Magnum | ||||||||||||||||||||
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.270 Weatherby 2nd from left | ||||||||||||||||||||
| Type | Rifle / Hunting | |||||||||||||||||||
| Place of origin | USA | |||||||||||||||||||
| Production history | ||||||||||||||||||||
| Designer | Roy Weatherby | |||||||||||||||||||
| Designed | 1943 | |||||||||||||||||||
| Manufacturer | Weatherby | |||||||||||||||||||
| Specifications | ||||||||||||||||||||
| Parent case | .300 H&H Magnum | |||||||||||||||||||
| Case type | Belted, bottleneck | |||||||||||||||||||
| Bullet diameter | .277 in (7.0 mm) | |||||||||||||||||||
| Neck diameter | .303 in (7.7 mm) | |||||||||||||||||||
| Shoulder diameter | .492 in (12.5 mm) | |||||||||||||||||||
| Base diameter | .512 in (13.0 mm) | |||||||||||||||||||
| Rim diameter | .531 in (13.5 mm) | |||||||||||||||||||
| Rim thickness | .220 in (5.6 mm) | |||||||||||||||||||
| Case length | 2.55 in (65 mm) | |||||||||||||||||||
| Overall length | 3.25 in (83 mm) | |||||||||||||||||||
| Rifling twist | 1-10" | |||||||||||||||||||
| Primer type | Large rifle magnum | |||||||||||||||||||
| Ballistic performance | ||||||||||||||||||||
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| Test barrel length: 26" Source(s): Accurate Powder | ||||||||||||||||||||
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