.270 Winchester
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".270" redirects here. For other rifle cartridges, see .270 caliber.
The .270 Winchester is a rifle cartridge developed by Winchester Repeating Arms Company in 1923, and it was unveiled in 1925 as a chambering for their bolt-action Model 54[3] to become arguably the flattest shooting cartridge of its day, only competing with the .300 Holland & Holland Magnum, also introduced in the same year.[4]
Quick Facts Type, Place of origin ...
.270 Winchester | ||||||||||||||||||||||||
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Type | Rifle / hunting | |||||||||||||||||||||||
Place of origin | United States | |||||||||||||||||||||||
Production history | ||||||||||||||||||||||||
Designer | Winchester | |||||||||||||||||||||||
Designed | 1923 | |||||||||||||||||||||||
Manufacturer | Winchester | |||||||||||||||||||||||
Produced | 1925–present | |||||||||||||||||||||||
Specifications | ||||||||||||||||||||||||
Parent case | .30-06 Springfield | |||||||||||||||||||||||
Case type | Rimless, bottleneck | |||||||||||||||||||||||
Bullet diameter | .277 in (7.0 mm) | |||||||||||||||||||||||
Land diameter | .270 in (6.9 mm) | |||||||||||||||||||||||
Neck diameter | .308 in (7.8 mm) | |||||||||||||||||||||||
Shoulder diameter | .441 in (11.2 mm) | |||||||||||||||||||||||
Base diameter | .470 in (11.9 mm) | |||||||||||||||||||||||
Rim diameter | .473 in (12.0 mm) | |||||||||||||||||||||||
Case length | 2.540 in (64.5 mm) | |||||||||||||||||||||||
Overall length | 3.340 in (84.8 mm) | |||||||||||||||||||||||
Case capacity | 67 gr H2O (4.3 cm3) | |||||||||||||||||||||||
Rifling twist | 1 in 10 in (250 mm) | |||||||||||||||||||||||
Primer type | Large rifle | |||||||||||||||||||||||
Maximum pressure (C.I.P.) | 62,366 psi (430.00 MPa) | |||||||||||||||||||||||
Maximum pressure (SAAMI) | 65,000 psi (450 MPa) | |||||||||||||||||||||||
Ballistic performance | ||||||||||||||||||||||||
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Source(s): Norma, Hodgdon,[1] Hornady[2] |
Close
Like the .280 Remington the .270 Winchester was derived from the .30-06 Springfield and the bore diameter was likely[5] inspired by 7mm Mauser. The .270 Winchester uses a .270 inch (6.86 mm) bore diameter and a .277 inch (7.04 mm) bullet diameter.