It's true you can change point of impact with different loads, usually you would have to slow down a bullet to hit higher, or go heavier. A lighter faster bullet would probably just hit even lower out of a revolver. At least that's the way it is for all mine. It is an option to experiment though.
Problem is, if your pet load is not hitting where you want, your kind of stuck never being able to use your favorite again in that revolver. I guess that's why I have made adjustments to a few of mine, gotta stick with my pet loads. I've filed a few front sights down to bring up the group, you get braver after doing it a few times.
Whatever you decide, that sure looks like a nice packing revolver.