Re: weird neck tension-please advise
Check for burrs on the inside and out side of the neck mouths. Also make sure that all necks are prepared the same. If there is powder residue on some but not others, if some have a little case lube in them and not others ect...
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.