Trapper,
Like the others have said, I wouldn't be too concerned about small dings and dents, so long as the casing goes into the chamber alright and the bolt isn't hard to close. In fact, try to make a habit of inspecting your brass if you are loading and shooting a bolt gun. I pulled a cleaver stunt several months ago when first starting to load for my new 6mmbr. A friend instructed me to load the bullet .002 into the lands which meant the bullet wasn't pressed into the casing very far. After I fired a few rounds, I wanted to eject a casing that I hadn't fired yet, but had closed the bolt on. Guess what happened when I opened the chamber. The casing came out alright, the bullet stayed in the lands and my gunpowder went all over the place inside the chamber. After getting most of the gunpowder out of the chamber (so I thought) I put in another casing, closed the bolt and fired off the round. When I ejected the casing, it had a neat little dent around the shoulder area of the casing. Thats when I looked into the chamber and saw a piece of gunpowder grain stuck to the wall of the chamber. That created that pretty little dent I just mentioned. SO a word to the wise, periodically check your fired casings and if you have dents, look into the chamber and check for crap or unburned gunpowder that may have gotten down in there. Sounds crazy and I know excessive lube does it also, but I thought I'd give you a scenario most never think about...crap in the mouth of the chamber of your weapon that dents your brass.