Seabeeken, I don't know if you tried this but try doing nothing on the coax and see what happens. Mine was terrible for seating, getting low run out on it was like maybe 2 for every 10 I made, the way the case lifts the die and die ring hit the top just doesn't seem like it would be conducive to making straight ammo, if case leans slightly one way or other the die ring kinda locks it in once it hits the top, anyways didn't work good for me, if I didn't have a runout gauge I wouldn't have known any better, old sloppy lee challenger was making better rounds, but could have got one that didn't line up.