Hey Todd, when did you get that coppermine? Did you get rid of the 300a? I really can't help you out because I have not gone to the coppermine yet. I would search through some of Big Lar's, Bladerunner's, Niteowl, or Maxout's old posts and see what they have there voltage at.
As far as temp goes.... seems like when the processor hits about 55f/ at extreme high fsb speeds, your done. As to voltage, It all depends on the individual cpu,But a general Rule of thumb, is to not go higher than .2 volts, or in your case, 1.85 volts....
Help me get this Boot outta my azz!!!!