The extreme spread values on your last two loads are quite high - indicative of erratic pressure behavior. We're these recentl reloads or perhaps old ammo? I once had some old 270 handloads given to me by my wife's grandfather. They gave wildly erratic velocities and signs of high pressure in my Model 70. After shooting a few I broke a couple down and found the powder was deteriorating (bad smell, odd colors). I pulled all the bullets and tossed everything else. The pressures I was seeing scared me. What spurred me to share that story was I saw very large ES values shot to shot.