I have a newly barreled 6.5 PRC that I am hitting pressure with a modest load of H1000 and 143gr ELDs. Book max said 59.0 gr and in my experience with every other gun I have ever shot the book max is still under what the gun will actually do. I started hitting pressure at a modest 56.5gr of H1000, Nosler Brass, and a FED 215. By 57.5gr I gave up when I started getting a heavy bolt lift. Any ideas on why? I know every gun is a little different but this seems extreme. Could the chamber be a little too tight?