I have a Lee press and wanted to know what other dies will work in it. I am looking to start reloading the 204 ruger and wanted to try a different brand of dies just for kicks. Is it possible?

All makes of current production dies will work in your Lee press.

All dies of 7/8"-14 thread bodies will work, some cartridges use larger dia die bodies.

Toss the Lee lockrings with the rubber o-rings and get Forster side-screw lock rings. The rubber rings will allow the die to move up and down several thousandths of an inch when you resize and this will cause the shoulder on the case to be in an incorrect location with respect to proper headspacing. Remember: "If it moves, it's junk." Lock 'em down tight with Forster lockrings. Hornady also makes a side-screw ring with flats on it for use with a wrench.