That sounds about right on the mouth size and slight dip under the bullet. I used a 44mag expander to open the case up pretty deep. I wonder if it might help to anneal the case first or if it would make it worse.
ETA: Never mind. I see you got the pic up.
Looks good. So would the 444 die work for the FL die? If we could make a longer expander or maybe use the 44mag.