Bluedevil,
Yes the size and shape of the firing pin and modern primers can cause some "stickiness" when opening the rifle with loads that are within pressure.
Original ammo had larger Berdan primers.
On some rifles the primers are removed from the front of the action, usually a bushing with 2 holes for a bushing wrench, I have seen even these holes cause problems if they are very close to the firing pins, thus allowing the primer to extrude into them.
Only allow a person with double rifle experience to work on your rifle. I can recommend JJ Perodeau at www.champlinarms.com