Re: powders to try in 300rum/180-200 grain pills
RL-25, RL-25, RL-25, Retumbo, if you have a tight neck or BR chamber H50BMG. Did I mention RL-25?
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.