I took my .308 out shooting today for just the second time. The first time out it put 5 rounds in an inch at 50 yards but then opened up at 100 yards to about 2 or 3 inches. I put a lot of the blame for this on me, the walking feet on my harris bipod and the shitty filling in the rear bag I was using. I got spike feet for the bipod so it stays put and I can load it a little and new filling for the rear bag that doesn't just collapse under the slightest of tension. This time my groups were the same as before at 100 yards and I felt far more steady. I noticed that the spent cases have 2 scratches on the mouth from the feed ramps, but otherwise no signs of damage. I've got a Faxon 20" heavy fluted barrel and read a thread somewhere about them sometimes having sharp feed ramps, but people were able to fix them. Im kinda nervous to go at my new barrel with a file or something. Does anyone have any suggestions on this? Or should I even be worried about it?