[Unclenick]

Gary is right that alignment is critical to straight seating. There are several ways to achieve it. One is to chuck the seating stem in a variable speed drill so you can slowly spin the stem with the seated bullet in the epoxy to look for wobble, and straighten any you observe. This method is limited by your visual acuity. You can chuck the stem in a drill press and set the bullet on its table while you lower the drill spindle to achieve full contact, and the lock the spindle into position. Another approach is to use a Lyman M-die die to create a step in a case mouth that holds the bullet upright while you use the seating die as Gary described to center the cast epoxy profile.