The .243 Winchester was initially designed as a target/varmint round. It may be used for animals such as coyote, deer, pronghorn and wildhogs. The .243 was introduced in 1955 for the Winchester Model 70 bolt action and Model 88 lever-action rifles. The .243 has become a popular sporting rifle cartridge.
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CIP, SAAMI SPECIFICATIONS:
Date of Origin: 1955
Case Type: Bottleneck Neck
Diameter: .276 in (7.0 mm)
Base Diameter:.471 in (12.0 mm)
Rim Diameter :.473 in (12.0 mm)
Case Length: 2.045 in (51.9 mm)
Primer Type: Large Rifle
Max Pressure: 60,000 psi