Quick Answer
Compressed loads can be safe in handloading, but it's crucial to follow precise procedures and guidelines to avoid over-compression and chamber pressure issues.
Safe Loading Practices
When loading compressed powders into your rifle casings, it’s essential to maintain an accurate and consistent charge weight. Using a digital scale with a precision of 0.1 grains or better will help you achieve this. A general rule of thumb is to start with a load that’s 10-15% below the maximum recommended charge weight, and then gradually increase the load in small increments while closely monitoring your rifle’s performance.
Pressure and Over-Compression
Compressed loads can be prone to over-compression, which can lead to increased chamber pressure and potentially catastrophic results. To mitigate this risk, make sure to use a powder that’s designed for compressed loads and follow the manufacturer’s guidelines for loading and seating depths. A good starting point is to use a powder with a compressibility rating of 0.5 or higher, and to seat the bullet 0.010-0.015 inches deeper than the recommended minimum seat depth.
Practical Tips for Compressed Loads
When loading compressed powders, it’s also crucial to maintain a consistent and precise powder fill depth. This can be achieved by using a powder funnel with a built-in depth marker or by measuring the fill depth using a caliper. Additionally, make sure to use a consistent and reliable seating die, and avoid over-tightening the die, which can cause the bullet to be seated too deeply and potentially lead to issues with chamber pressure.
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