Quick Answer
To identify overpressure signs in your reloads, examine the cartridge cases for excessive primer flattening, cratering, or discoloration, and also check for case head separation or cracking. Overpressure can also be indicated by excessive neck tension or bulging.
Inspecting Cartridge Cases
When inspecting cartridge cases for signs of overpressure, pay close attention to the primer area. A flat, dented or cratered primer face can indicate excessive pressure buildup during firing. Look for a primer size that’s 1/16 inch or larger than the standard primer size. Also, if the primer is showing excessive discoloration or a dark ring around the primer pocket, it may be a sign of overpressure.
Measuring Chamber Pressure
To measure chamber pressure, you can use a pressure gauge or a chronograph to measure the velocity of the bullet. The SAAMI maximum pressure limit for most rifle cartridges is around 52,000 psi. If you’re reloading a cartridge with a maximum pressure limit of 52,000 psi and your pressure gauge reading exceeds 55,000 psi, it’s likely a sign of overpressure.
Neck Tension and Bulging
Neck tension is another important aspect to consider when reloading. Excessive neck tension can cause the case to bulge or neck blow during firing. To check for excessive neck tension, insert a case into the chamber and twist it gently. If it resists twisting or feels like it’s going to break, it’s likely a sign of overpressure.
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