You are really getting some variations there. That is more than I see when loading 4831. When loading for a coarse stick powder, set the measure so it consistently throws low and trickle up. Even with 4831 it doesn't take that long especially with the number of hunting loads typical of a 270.
Doing the taps to settle the loads should also help, do one or two with the lever at the bottom of the throw, it doesn't make much difference how many you do as long as you do the same number every time.
