If opening up the 200 line solves the problem, it isn't exceeding maximum pressure. Strange though, I'm around a grain below max load in my rifle that experiences clickers.
I don't own a PRC or have plans to buy one so I don't have a horse in this race, just clarifying terms for the sake of the discussion. By max pressure, do you mean max SAAMI pressure or max pressure based on "traditional" pressure signs? Same with loading "a grain below max", do you mean a grain below book max or a grain below max based on pressure signs i.e. sticky bolt lift, ejector swipes, etc? ....carry on fellas, interesting discussion.
