Welcome aboard Reed
The reason .223 data ranges all over creation is that it's one of those accommodating rounds that works passably with almost anything. Kind of a good news/bad news thing, but that's a happily dilemma, huh?
Start out with any 4985, 2520, 748 combination that's reasonable and chances are you'll find something that suits you.
FWIW, my Savage shoots almost anything well and shoots 52 Sierras over H335 into tiny little bugholes. Hornady V-Max 50's and IMR 4895 do the same.
Redial