Make bullet run-out a thing of the past with the new Hornady Ammunition Concentricity Tool. Hornady never ceases to find ways to provide unmatched accuracy in every facet of the shooting experience. The new Ammunition Concentricity Tool is the first tool on the market to both identify and eliminate bullet run-out. Just place ammunition in the tool, roll it, identify run-out, and use the dial indicator to adjust run-out to zero! It can be used to true-up factory ammunition, too.