I had a BAR in 300 wm. As long as you clean your rifle, you should have not issues with feeding. If its very cold, make sure the bolt is slammed all the way forward. One issue I had on one occasion was that I was hunting in very cold temperatures, around 15 degrees, and I release the bolt and it slammed forward but not all the way. I did not realize this until I went to pull the trigger on a deer. The gun just went click and no boom. It actually released the firing pin. I guess I should be greatful that it was not close enough to the primer to set it off. There is no telling what would have happened.