@GWH I arrived at 51.5gr, a low 83.6% filling, 2636 fps, 63616 psi, max 63817 psi.
That was using a shot start of 3626 psi and a Weighting Factor as offered of 0.5
This is the specs for CFE223. If you can in your version temporarily overwrite another powder and try and see if you get what I got. If you do you are good to go playing with the settings to match a lowish load velocity.
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