The RCBS UMP-3 Competition Powder Measure is a precision reloading tool designed for shooters who demand consistency in every handload. Built on the proven Uniflow Powder Measure platform, the UMP-3 adds a micrometer adjustment screw and powder baffle to give you repeatable charge weights with .10 grain accuracy—essential when you're chasing tight groups at the range or working up loads for competition. Whether you're loading rifle or pistol ammunition, this single metering cylinder handles charges from .5 to 100 grains, making it a versatile centerpiece for your reloading bench.

The powder baffle is the real workhorse here. It regulates powder flow and controls column pressure on the metering unit, which translates to more stable, uniform charges run after run. The micrometer adjustment screw lets you dial in your exact charge weight with precision—and critically, it lets you record that setting for future sessions, so you can replicate your loads without guesswork. The threaded hopper (1 pound capacity) is quick to remove for cleaning or switching powder types, and the included drain attachment with two drop tubes keeps your setup flexible and efficient.

The ambidextrous handle positions on either side of the measure to suit your reloading style, and the cast iron body is built to last. Keep in mind that the UMP-3 works best alongside an accurate powder scale for initial charge verification and spot-checks during a loading session—it's a measure, not a scale. And a critical safety note: never use this measure with black powder.