I went to the range today and after a few rounds I realized in order to close my bolt all of a sudden requires increasingly more effort. I did not have this issue before. Shot maybe 800 rounds with this Savage Target Action single shot RBLP. I tried cycling the spent cases and could not even close the bolt on those. This are brand new Lapua cases at the first firing. Came home and put in the receiver my Go Gage I used recently to mount/headspace the new barrel on this gun (6.5x47 Lapua). I can't even close the bolt. When I left for the range I tried a few loaded cartridges and the bolt closed fine. What is more ironic is that I have an exact replica of this action waiting to be mounted on a new build. I tried the bolt assembly from this other action and it works just fine. Please help. What must I do to fix this problem.

Thank you,