Clay,
One other item you might check is to disassemble the bolt and remove the firing pin and spring. Get can of brake cleaner or gun scrubber and give it a good cleaning up inside the firing pin channel. It could have just enough junk in it to cause the pin not to extend far enough. I would try this before modifying the pin. Just clean it and they try some primed unloaded rounds in rifle to see if it will set them off.
DonT
