RCBS Precision Micrometer .338 Win Mag - 88331

This precision micrometer measures chamber headspace and bullet seating depth to 0.001 inch accuracy, measuring from the datum point on the case shoulder to the base for SAAMI tolerance readings. It is an essential tool for reloaders seeking to create safe, accurate loads while extending the life of rifle brass. The tool requires only a few twists to determine critical measurements.