Case Master Concentricity Gauging Tool by RCBS RELOADING PRODUCTSA quick and convenient way to determine several important case and cartridge dimensions. The Case Master® gauging tool measures case neck concentricity and uniformity and thickness and as well as case length and bullet run-out. All are important to accuracy and safety. Detects case head separation before symptoms are apparent on the outside of case. Much quicker than a dial caliper and makes a tedious job simple and less tiring.
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