I've made it to the point where today I dropped my first power charge and seated a 220 grain Speer Flat Point into the case. I began by seating the bullet to the bottom of the neck, as recommended. The round would not chamber. I slowly seated it deeper and deeper with no effect. The round sticks out of the chamber maybe an 1\8" to 1\4". I found I could push the round in a tad further with my finger, but then had to force extraction. I don't see rifling Mark's on the ogive, it looks like I see a slight ring mark maybe. The case mouth did seem rougher after this ordeal.

I'm at a loss. The formed cases alone seemed to fit perfectly and the action closed easily and completely. If I had to guess, I'd say seating the bullet into the case expanded the neck enough to keep it from chambering fully. Anyone have any ideas? Thanks!