Hey guys. I have recently brought a savage 110 .308 bolt action second hand. The first 6 or so rounds through it fired good but then the bolt started getting hard to pull back. Now i have to put serious weight on the bolt for it to slide back. I have been told that it may be carbon build up as im not sure if the last owner cleaned it very often. The rounds also push in but once they get to a point it takes a bit more effort. Any advise or ideas would be very much appreciated. Cheers