You have the tools. You have the materials. You have the reloading book(s).
Start building up loads yourself and form your own opinion!
Can you get consistent holes in paper with your given primer/powder/bullet/rifle combo ... preferably at a velocity / charge you prefer ?
If you can, then yay!
You're going to undoubtedly consume all of your given powder (just so you get your money's worth). IMR 8208-XBR is a thermally stable powder so you'll probably enjoy it and would probably make a decent hunting load powder (where it might be freezing out etc).
Just a co-instructor reminder: make sure your 223 primers are seated deep enough. They should be at least a little shallow from the case head. AR15's with their floating firing pin can have an issue with slam fires if your primers aren't seated deep enough. This doesn't mean you need to crush the primer within the brass, but they should be recessed a bit
.