What steel would be best to use for a set of swaging dies for .223 bullets from 22LR brass? I'm considering O-1, but don't know if there is another steel that is easier to machine, but also easy to harden? I have some limited capability to do my own heat treating at home, and have done heat treat and temper with 1095 for knifemaking, but don't want to use a steel that requires complicated heat treatment, or high temperatures for more than a few minutes.
I'll be making the dies from 1" (or 7/8" if available) round bar stock.