My ammo is loaded and unloaded into rifles many times during hunting season, carried in vest pockets. A scuffed up case head, a piece of dirt or debris of some kind, any number of things and all of a sudden it's tight without a person knowing it. Less than .020 on a caliper is a cat whisker between the jaws. For me and hunting it's function, function, function, first and foremost or otherwise I figure it will bite me at the most inopportune time.
Got in the blind, went to load the same round I had chambered, ejected, repeat at least 10X. This time the bolt would not cam for any amount of money. Thought all of what you mentioned above. After repeated attempts, I removed the bolt, looked into the chamber, ran my finger up in there, found nothing. Looked at the bolt and there, perfectly paper punched, was a leaf the diameter of the breech face inset. It created a no-go situation. I even had packed up the gun in defeat, but then gave it another try.
