I found an AR I want and will have it tomorrow. I've spent the weekend getting up to speed on the platform and my gun. I've also been looking at reloading. I'm more of a practical reloader loading for plinking, hunting, and SHTF stashing. With that in mind I like the idea of a flexible powder. The only other rifle I load are 30-30 and 30-06 (Garand loads). I got 7mm Mauser dies for Christmas but haven't gone any further there. So two questions: I have used IMR4895 only. It looks like a good powder for 223. Any opinions? Is 223 and 556 load data interchangeable? No need for long tutorials on reloading, but I'd love to hear advice on 223/556. With range brass being in nearly unlimited supply, low bullet and powder expense I can see this being a fairly cheap plinking rifle cal. I'm looking forward to learning and loading for the AR.