I'm late to the party here, but since this is a "reloading" thread... I see you're doing all the standard experiments, but I'm not seeing much data on your loads. For starters, I don't find that IMR4350, though it's one of my clear favorites, is the "do-all" for every cartridge. How's your loading process? When I was young, I was all about stuffing the fastest load listed for my powder into the case and topping it with a cool bullet. For hunting, those "garage loads" were usually fine, but really no better - and usually worse, accuracy-wise - than factory loads. It wasn't until I started shooting competitively past 600 yards that I got serious about my loading processes.
I see that you're posting what I'm assuming are velocities, so I'm assuming that you're using a chronograph? What are the stats behind them? Extreme spread? Standard Deviation?