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The Case Master gauging tool quickly evaluates case neck concentricity, uniformity, and thickness, as well as case length and bullet run-out, among other essential case and cartridge measurements. Case neck concentricity, homogeneity, and thickness, as well as case length and bullet run-out, may all be measured rapidly with the Case Master gauging instrument. All of these factors contribute to accuracy and safety. Case head separation is also detected before symptoms appear on the outside of the case. The gadget is much faster than a dial caliper and simplifies a time-consuming task.