Tried them and the Arbor press. Too slow with no gain in concentricity, accuracy of seating depth etc. If anything, being consistent with the Arbor press was a lot tougher than using a regular press. Biggest improvement I found was by working over the press to make sure everything was lined and square, ram ran true and linkage worked right. Once you got the press good a tight they make great concentric rounds. A lot of what gets blamed on dies is actually the press.
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