Hornady Rifle Micrometer Metering InsertRifle Micrometer Metering Assembly is the perfect tool for the reloader looking to improve the function of their Hornady Powder Measure. It features an micrometer dial adjustment for making very small adjustments allowing the reloader to dial in their powder charge. Designed to reload and throw charges of rifle powder between 10 to 100 grains, depending on the brand/type of powder used.