Re: Optimal Barrel Length
I think someone is uneducated and full of crap. 21.? whatever may be perfect for some caliber(s) but no all. Bore diameter, case size, case dimension, case design and I am sure a whole lot more than that will determine what the best bbl length is. He probably reads "rifle shooter" of some other magazine that has no practical experiance...
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.