The RCBS Uniflow Powder Measure will throw consistently accurate charges by volume with all types of smokeless powder. The straight forward measuring cylinder design helps eliminate powder hang ups which can lead to double charges or overcharges. The numbered measuring screw changes easily from charge to charge, and enables you to go back to a known charge at a later date. The precision ground cylinder is honed main casting produce a smooth and accurate powder dispensing system. Mount is a standard 7/8 to fourteen thread, comes with a bench or shelf bracket and two drop tubes for 22 caliber and up. Mounts on the RCBS Powder Measure or the Sinclair Powder Measure Stand (11-1200), accepts Sinclair Drop Tubes with a Sinclair Adapter. DO NOT USE WITH BLACK POWDER.