.276 Enfield

.276 Enfield
.276 Enfield experimental rifle cartridge
Type	Rifle
Place of origin	United Kingdom
Production history
Designer	Royal Laboratory
Designed	1912
Produced	1912–1916
Specifications
Case type	Rebated, tapered, bottleneck
Bullet diameter	.282 in (7.2 mm)
Neck diameter	.323 in (8.2 mm)
Shoulder diameter	.460 in (11.7 mm)
Base diameter	.528 in (13.4 mm)
Rim diameter	.517 in (13.1 mm)
Case length	2.35 in (60 mm)
Overall length	3.23 in (82 mm)
Case capacity	72 gr H2O (4.7 cm3)
Rifling twist	1 in 10" (254 mm)
Primer type	Berdan
Maximum CUP	50,763 CUP
Ballistic performance
Bullet mass/type Velocity Energy 165 gr (11 g) 2,785 ft/s (849 m/s) 2,842 ft⋅lbf (3,853 J)
Source(s): [1] Major E. G. B. Reynolds (1960). The Lee-Enfield Rifle (PDF). London, Reading and Fakenham: Cox and Wyman Limited. p. 126.

The .276 Enfield (7×60mmRB) was an experimental rebated rim tapered bottlenecked centerfire military rifle cartridge developed in conjunction with the Pattern 1913 Enfield (P'13) rifle. Development was discontinued by the onset of World War I.