RCBS Precision Micrometer .300 Win Mag - 88327

The RCBS Precision Micrometer measures chamber headspace and bullet seating depth to 0.001 inch for precise SAAMI tolerance readings. This measuring tool determines critical dimensions from the datum point on the case shoulder to the base, enabling safe and accurate reloads while extending brass life. Essential for reloaders seeking spot-on measurements for consistent ammunition performance.