I have a Savage Mark II, and have never had this issue until today. I shot about 100 rounds today, and towards the end of the day, 2 spent shells didn't extract. In fact, they got stuck in the barrel. I was able to get them out fairly easily using a screw driver, but I can't figure out what would cause that. I fired about 15 rounds after the 2 got stuck, and it seemed fine. Ammo maybe? I was using what i always use: CCI Mini Mags. Any ideas? Thanks.