My powder preferences in order are:
Win 748 (good all around performance and meters well)
IMR 4198 (super accurate @19.1gr.)
CFE223 (great velocity/ pressure ratio)
BLC2 (was developed for the 5.56NATO round)
H335
H4895
You will notice that all of these powders are ball except for the H4895. In a small case like the .223, the ball powder takes up less volume and it meters well through a powder measure. I use several powder measures (Hornady, on my L&L AP, a Lee measure on my Lee 1000 progressive press and a stand alone Lee powder measure. Both Lee products have been upgraded from the disks to the micrometer insert.)
Contrary to the manuals recommending magnum primers for ball powder, I use either CCI Small rifle or Winchester small rifle primers. I have not had any problems with either.
I also trim my brass initially and then again when required. (I measure a few cases from each fired lot to see if they need a trim and if they check out, I don't bother trimming the whole batch) Even if you are well below max load, you WILL get pressure spikes if you shoot cases that are too long, as the brass in the neck area will interfere with the throat area of the chamber, so best to keep an eye on it. It's sort of like kinking a garden hose. When you let it go, the water comes out with more force for a second or two. Same applies with shooting a gun; except the fluid is the expanding propellant gasses.
Have fun and be safe.