I shoot black powder in all of my rifles including my inline rifles. I think you get the best accuracy and consistent shot to shot accuracy with black powder. Sometimes you have to load a little more to make up for the power difference.

With black powder you have to swab the barrel more often when shooting sabots, but it will surprise you how easy a second even a third shot is possible without swabbing.

Good luck with the Goex. It really is a good shooting powder. Very consistant and ignites real easy.