I use 23 grains of varget under a 55 grain vmax for my 223 loads i put in my single shot. Varget works well in 223. You need a reloading handbook! But my hornady book says 22.8 grains of Varget will push a 55 grain bullet 2800 fps. The MAX load says 26 Grains which should push it 3200 fps.
I understand the joy of shooting your own rounds but when I owned my bushmaster AR (2 weeks ago) I found it not worth the hassle with a single stage when you can get 20 shells for 8 bucks of FMJs. I find small calliber rounds with a neck like that to be a PITA to load. Especially when your shooting them as quick as you probably will be.
I find an accurate single shot is great for testing rounds i put extensive effort into.
Have fun and keep shooting
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