Bruce,
I did some fiddling with primer pocket depth tonight and discovered that when reaming Starline .44M cases to accommodate a Fed 210 one needs to remove about .005" to .007" before the primer seats flush or slightly countersunk. When removing this amount of brass, the web on a .44M Starline case is still .010" thicker than the web on a .45C Starline case. So there ya go... if you've got an action that'll handle 50K CUP, load the .44 Magnum up (gradually) and use rifle primers... or just be satisfied with the mundane.
MJ