For the highest level of safety and accuracy, Lyman strongly recommends inspecting all bottleneck rifle cases after resizing to ensure that critical headspace dimensions are within specifications. The most accurate and efficient way to verify this is with Lyman's case length/headspace gauge. Simply insert your resized case into the gauge to check that it meets both the maximum and minimum headspace requirements. Additionally, the gauge will alert you to any cases that exceed the maximum allowable case length. Any case showing excessive headspace should be discarded immediately. Lyman's gauges eliminate the guesswork in reloading, ensuring precise and reliable results every time.

Verifies case headspace
Detects instances of prolonged duration

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