Those are some good suggestions and I think that I do need to start looking for a solution by adjusting my loads and powders. When shooting 85 grains of RL-15 my POI is just over 3" low at 50 yards. I've been working on loads for other calibers the past couple of weeks and have not had a chance to try to fine tune a load for my .470. I suspect I just haven't yet matched the load for which my gun was regulated.
I would really prefer not to have to adjust my sights if I can correct things ballisically. Coming from the bolt-action world, I still think it's amazing that you can do that to some degree.
Out of curiosity, what sort of change in my POI would you guess I'd see if I increased my load from 85 grains to 89? Would it do anything besides bring together my respective barrel groups as long as the POI's do not cross?