I'm having a problem with my shells getting a large bulge out the bottom of the brass when depriming. There is a lot of resistance once the depriming rod makes contact. The hulls are Winchester Super-X 10 gauge steel once fired factory loads.
For kicks and grins I stuffed a 12 gauge 2 3/4" Winchester AA (grey) hull in the depriming station and it popped out the primer no problem and no bulging of the head.
Press is a MEC Steelmaster for 10 gauge.
So any ideas what's going on?