JAr-wv,
Remove the operating rod, pull the handle down. Now manually pull the primer slide back, see if the return spring pulls it forward easily. If so, then clean & lube the top of the operating rod where it enters the bracket. If not, does it freely move until the cup goes into the primer feed body, or does it continuously drag? If continuous, call Dillon, ask for gary at ext.311, and ask for replacement primer slides and shim. If only when the cup goes into the feed body, measure from the underside of the primer slide to the top of the cup using calipers. Should measure 1.215"-1.220". If too tall, use a clamp or vise to reset, then retighten the set screw. If at correct height, replace the magazine tip.