Posting in normal English...

The 22 CM is effectively a 22-250 AI with a 30 degree shoulder. Factory brass and dies are readily available.
In a pinch, drop load by 1.5gr and use 22-250 brass to fireform.

Sweet spot is 80-90gr bullets in a twist between 7" and 8".

RL23 (80gr) and RL26 (88gr) have been superb though a bunch of other powders with similar burn rate work as well.

Experience is what you get when you don't get what you want.