I have a Montana 99 action (sim. to pre64 Win 70) that is intermittently making a very poor firing pin strike with no ignition. I have replaced the spring and put in a 30 lb. Wolff. I have adjusted the firing pin extrusion to 0.85 with the bolt out of the rifle. I have spun a cotton swab soaked in rubbing compound inside the bolt barrel. I have polished the firing pin spring washers, thinking they might be binding inside the bolt barrel somehow. It will fire a few or several rounds and then give me a dud. The first two loads this aft were duds and I didn't try any more. This was one of the duds and is typical of the problem. It is a too-shallow dent and the round did not fire: Outside of an exorcism, can anybody think of anything I missed?