Get on Predatormasters.com and/or Google search for reduced loads/223. Hodgdon's has a few powders that they have worked actual pressure numbers upon, but Trail Boss and H4895 seem to be the ones that are most versatile. In general, guys are saying go with a lighter weight bullet, and try to keep it under 2800 fps or so. Fox are just little buggers under all that hair! Doesn't take much to blow them up.
Try these sites on top of a general search:
Hodgdon.com (click Reloading data, then agree, then cartridge loads, then 223 Rem.)