.243 Case Dimensions: A Comprehensive Guide
The .243 Winchester is a popular centerfire rifle cartridge that has been widely used for hunting and target shooting. One of the essential aspects of reloading and firing this cartridge is understanding its case dimensions. In this article, we will delve into the details of .243 case dimensions, providing you with a comprehensive guide to ensure accurate and safe reloading.
Case Specifications
The .243 Winchester case is a bottlenecked cartridge with a rimless design. The case dimensions are as follows:
Case Length
The overall case length of the .243 Winchester is 2.045 inches (51.9 mm).
Case Diameter
The case diameter at the base is 0.473 inches (12.0 mm), while the diameter at the shoulder is 0.445 inches (11.3 mm).
Rim Diameter
The rim diameter of the .243 Winchester is 0.473 inches (12.0 mm).
Shoulder Angle
The shoulder angle of the .243 Winchester is 20 degrees.
Neck Diameter
The neck diameter of the .243 Winchester is 0.277 inches (7.04 mm).
Tolerances
While the above specifications provide the ideal case dimensions, it's essential to understand the tolerances allowed in reloading. The following tolerances are recommended:
Case Length Tolerance
The case length tolerance is +/- 0.010 inches (0.25 mm).
Case Diameter Tolerance
The case diameter tolerance at the base is +/- 0.002 inches (0.05 mm), while at the shoulder it's +/- 0.001 inches (0.025 mm).
Rim Diameter Tolerance
The rim diameter tolerance is +/- 0.002 inches (0.05 mm).
Conclusion
Accurate knowledge of .243 case dimensions is crucial for safe and effective reloading. By understanding the specifications and tolerances outlined in this article, you'll be able to reload with confidence and achieve optimal performance from your .243 Winchester rifle. Remember to always follow proper reloading procedures and safety guidelines to ensure a enjoyable and safe shooting experience.
