BD, the good news is that there are at least a dozen powders that work well in the .223. My preferred powder is Ramshot Tac. It has worked well for me with bullets from 40 gr to 77 gr in several different rifles. It meters great out of my RCBS Uniflow measure, it contains a "de-coppering" agent, so you can fire a few hundred rounds without serious accuracy degradation, and it is reasonably priced. I have also used most of the others, with the powder I won't try again being H-4198. If you don't mind weighing individual charges, then extruded (stick powders) powders are fine, I have even loaded IMR-4064 with decent results with 50 to 69 gr bullets. A little on the slow side velocity wise, but acceptable accuracy. IMR 4895 and 8208 XBR also have worked well for me along with Reloder 15, Accurate 2015 and H-4895 and Varget.
For spherical (ball) powders, Accurate 2200, 2230, 2460, Hodgdon H-335, Win 748 and Ramshot Exterminator also work fine and meter much better in a powder measure. These have all worked for me over the years.
Seems like the most popular powders for the .223 are H-335 and Varget, with Accurate 2230 and Ramshot TAC moving up recently. You could try one (or all) of these to find out which one your rifle prefers. Of course you may find out that different bullets prefer different powders, if you are looking for optimal performance.
If you are frugal (like me), you might want to gamble if you find a powder on sale. I ordered 2 8 lb kegs of Ramshot Tac for $79.95 each years ago without having actually tried it in my rifles. Since then, I have gone through those and another 8 pounder. (Guess I should have ordered 4 of them originally...). You might check some online sources and see if anyone has a special sale going on.