.276 Pedersen

.276 Pedersen
En-bloc clip loaded with 10 rounds of .276 Pedersen. Image from John Pedersen patent.
TypeRifle
Place of originUnited States
Service history
In service1923–1932 (experimental)
Used byUnited States
Production history
DesignerJohn Pedersen
Designed1923
Specifications
Case typeRimless, 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 length2.023 in (51.4 mm)
Overall length2.855 in (72.5 mm)
Primer typeLarge 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, later versions of the Thompson Autorifle and early versions of what would become the M1 Garand.

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