Steve. Looks like you have a great group and load going there. I wouldnt change a thing. Most loads and barrels have a sweet spot and it looks like you found it with that powder. I would hunt with it this season and if you wanted more speed you might change powders and play around with it a bit after season. You may be able to squeeze a bit more fps with a different powder and keep the same accuracy. The saying if its not broke dont fix it comes to my mind though! Good luck on the hunt!