I took my 17s out to the range yesterday, and while I was sighting in my red dot I had a light primer strike. Before this range session I had put close to 100 rounds through my rifle, so having the light primer strike was a bit odd. I pulled the round, noticed it indeed had a primer strike, loaded it back into the mag, chambered and fired as it was supposed to. Now after every 4 rounds I would eject the round that had chambered and noticed that the primers had slight marks, as if the firing pin was tapping the primer when being chambered. What could cause a problem like this, and more importantly how close was I to meeting my maker from a kb?