Standard Tube Micrometer
When accuracy is the issue, all aspects of the cartridge case must be considered.
Concentricity of the case neck is a prime consideration. Inconsistent neck wall thickness will cause the seated bullet to be misaligned with the bore. To measure neck thickness, you need a measuring tool designed specifically for this task. The Frankford Arsenal Case Neck Micrometer measures neck thickness to .0001".
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Battenfeld Product Item Number #107083