off the 'cuff
A quick answer and my go to plinking powder in .223/5.56mm these days is CFE223. I hesitate to list a charge weight w/o checking further.
Biggest hassle in loading .223/5.56mm is removing the primer pocket crimp. My observation has been that .223 stamped brass may or may not be crimped, but 5.56mm will. In recent years it seems a lot .223 brass primer pockets are now crimped as well. There are tools, power driven or manual, that make this process easier. Once done, no need to redo, keep decrimped brass separate to ease your work load.
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