Daniel.....
There are several powders that work well in the 223 Rem...Win 748, BL-C(2), H-335 just to name a few. Years ago I had a 223 that loved Accurate 2230. Try the ball powders as they will meter well.
With that said, I just started working up some loads for this 700 LVSF in 223 Rem. Here are some 3 shot groups @ 100 yards I shot today using a 40 gr Ballistic Tip and Benchmark powder. From middle of the road to near maximum according to Nosler.The load that was 1/2 grain under max shot a .240" group. Theaverage of all the groups are .411" which isnt a bad start.