Re: preasure problems with 7 ultra
I had a 300 RUM barrel with the same problem. After about 65 rounds down the pipe, I started seeing huge pressure increases. It got worse every day. I would back off powder and things would still be hot. Turned out it was a VERY cooked throat. This cause a lot of friction and subsequently increased the pressure.
The 7mm RUM will cook a throat even faster.
Sorry for the bad news.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.