I have a Remington 700 300 Ultra Mag. When I chamber a round, the bolt is hard to close at first. After the round is chambered, I can lift the bolt and close it over and over and it is easy to close. I tried the bolt out of a friends Model 700 300 Ultra Mag, and his bolt closes easy in my rifle. I have fired around 100 rounds through the rifle, and there have been no signs of excessive pressure. The bolt is easy to open after each shot. The bolt is only hard to close when first chambering a round, It does this with a live round and an empty shell. Do I have a Headspace problem or is my bolt the problem?