Well, neither was I.
Thanks, you answered my question - the guy is a serious shooter, and not an "armchair expert".
Maybe I could have phrased it more sensitively, and I'm sorry you took it badly. But if you know a lot of shooters, then you have surely come across the types who are permanently fiddling about with microsopic load variations - in effect blaming their performance on the less-than-perfect load.
If your friend was offended, he has my unreserved apologies.