Specifications:
- Parent case: .30 Thompson Center
- Case type: Rimless, bottleneck
- Bullet diameter: .2644 in (6.72 mm)
- Land diameter: .2559 in (6.50 mm)
- Neck diameter: .2950 in (7.49 mm)
- Shoulder diameter: .4620 in (11.73 mm)
- Base diameter: .4703 in (11.95 mm)
- Rim diameter: .4730 in (12.01 mm)
- Rim thickness: .054 in (1.4 mm)
- Case length: 1.920 in (48.8 mm)
- Overall length: 2.825 in (71.8 mm)
- Case capacity: 52.5 gr H2O (3.40 cm3)
- Rifling twist: 1 in 8 in (203 mm)
- Primer type: Large rifle, Small rifle (Alpha Munitions, Lapua, Peterson, and Starline brass)
- Maximum pressure (C.I.P.): 63,091 psi (435.00 MPa)
- Maximum pressure (SAAMI): 62,000 psi (430 MPa)