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My pet load was with Berger 35gr. and 26.7 Ramshot TAC seated 7 thou from rifling @ 3871 fps
This was from about 8 years ago. The rifle was sold but I still have my reloading notes.
This load was based on NOSLER 223 custom brass which was resized using a bushing die with .235" bushing followed by a .226" bushing. MY primers were BR4's
The brass will make a big difference in your pressures and velocity.
I prefer to stay away from NOSLER brass since then and suggest REMINGTON ...as it develops more pressure/velocity with less problem.
If you can't find RAMSHOT TAC...choose a powder close as possible in same burn rate.
I still shoot 20Cal's and prefer the 39SBK over the Berger 35gr. for better accuracy and coyote kills without fur damage.
Enjoy