With the Multi-Purpose Overall Length Gauge attached to yourCalipers any standard bushing can be used to measure the length of your loadedround from ogive, fired or unfired case length from Datum line or length ofindividual bullets from ogive. By simply replacing the bushing the combinationsare endless. Inserts from the Hornady Bullet Comparator will also fit this gauge.Now designed with a longer form factor to accommodate up to .375 cal. bulletssuch as those made by Cutting Edge and Lehigh.