The Dillon Precision Powder Measure is for the RL550, XL750, and XL650 reloading machines and offers excellent, repeatable performance. Accuracy within +/- .10 grains, the Dillon Powder Measure provides the accuracy and speed needed for reloaders. The powder measure is case activated and will only drop powder when a case is present. The powder bar will travel its full length until it is flush with the powder measure's body. This case-activated time-saver helps mitigate messy spills were a casing isn't present during cycling. Fits the RL550, XL750, and XL650 Accuracy within +/- .10 grains Powder only drops when a case is present Prevent messy spills