Some good shooting there... Looking at your groups, if you aimed center mass on the kill zone of a whitetail deer, you would have hit. Granted, you might have had to adjust for drop at 150 yards, but face it that group you shot did have the long range potential. The question is, does the bullet have the ability.
Also my understanding is, this is a pistol bullet. So it "preforms" best at certain velocities. I think your right in that range with 85 grains of powder. My rifle is doing great at 30 yards, but I wonder what about further back? So that was a very interesting report. Keep shooting them. I hope you harvest a deer with one next year. It would be interesting to see how well it does.