.276 Pedersen

.276 Pedersen
En-bloc clip loaded with 10 rounds of .276 Pedersen. Image from John Pedersen patent.
Type	Rifle
Place of origin	United States
Service history
In service	1923–1932 (experimental)
Used by	United States
Production history
Designer	John Pedersen
Designed	1923
Specifications
Case type	Rimless, bottleneck
Bullet diameter	.2842 in (7.22 mm)
Neck diameter	.313 in (8.0 mm)
Shoulder diameter	.385 in (9.8 mm)
Base diameter	.450 in (11.4 mm)
Rim diameter	.450 in (11.4 mm)
Case length	2.023 in (51.4 mm)
Overall length	2.855 in (72.5 mm)
Primer type	Large rifle
Ballistic performance
Bullet mass/type Velocity Energy 125 gr (8 g) 2,740 ft/s (840 m/s) 2,058 ft⋅lbf (2,790 J)

The .276 Pedersen (7×51mm) round was an experimental 7 mm cartridge developed for the United States Army. It was used in the Pedersen rifle and early versions of what would become the M1 Garand.