Optimal Case Length for Handloaded .308 Rounds?

Case Length Considerations

When it comes to handloading .308 Winchester cartridges, understanding the optimal case length is crucial. In general, the .308 case is considered to be on the shorter side compared to other popular hunting cartridges. This shorter length presents a unique challenge when attempting to achieve the desired case capacity and pressure levels.

Factors Affecting Optimal Case Length

Several factors come into play when determining the optimal case length for handloaded .308 rounds. These include the specific bullet weight, seating depth, and desired performance characteristics such as muzzle velocity and pressure levels. For example, lighter bullets (around 150-160 grains) tend to perform better with slightly shorter case lengths (around 2.015"), while heavier bullets (180-200 grains) can benefit from slightly longer case lengths (around 2.065"). A good starting point is to use a case length of 2.020" and adjust as necessary based on load development and pressure testing.

Measuring and Controlling Case Length

To ensure consistent case lengths and prevent over-length cartridges from entering the chamber, it’s essential to use a reliable case trimming tool. When trimming cases, it’s generally recommended to remove no more than 0.005" to 0.010" of material at a time, as excessive trimming can compromise the case’s structural integrity. This process should be repeated until the desired case length is achieved, and the cartridge is then ready for loading.