The .270 was developed by Winchester in 1923 and released in 1925. It was intended as a chambering for their Model 54. This cartridge is a necked down .30-06 Springfield and is the same length as the .280 Remington. The .270 has gained in popularity among hunters and gun owners.

• Date of origin: 1923
• Case Type: Rimless, bottleneck
• Neck Diameter: .308 in (7.8 mm)
• Shoulder Diameter: .441 in (11.2 mm)
• Base Diameter: .470 in (11.9 mm)
• Case Length: 2.54 in (64.5 mm)
• Primer Type: Large Rifle
• Max Pressure: 65,000 psi (450 MPa)