Re: 7mm RUM velocity
I read an arctile in the "Western optics hunter" magazine recently that had a 7mm RUM built on a Ruger #1 action w/a 28.5" bbl and he claimed to be getting 3730 FPS w/140 Nosler ballistic tip. around 1/2" group. I do not know what powder he used, I imagine it was something like RL-25 or some super slow powder.
I dont know exactly how true it is either.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, 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.