Re: Barnes bullets
180 with a BC of .552 is OLD data from the original XBT. The ogive design and overall length are totally different from the the TSX not to mention the grooves where as the XBT had no grooves. .552 will not work for the TSX bullet period.
BTW they do not offer the XBT any longer.
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.