Since you have RL 15, I'd use that... about anything works in a 223, but RL 15 stands out in my experience...
I am RL 15 poor at the moment... but have plenty of H 322 and Benchmark, along with 3031 and a host of other powders...
If I had every powder under the sun, RL 15 would be one of the first I'd reach for if I wasn't doing reduced loads.
"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC
“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez
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