500 grain Hornady or Woodleigh
F215
84 grains IMR 4320

If you decide to use this load, start low, work up, double check the data, you assume all the risks, etc. This load may be unsafe in your gun and may cause it to blow up, causing injury or death.

500gr I have tried 4320 from 77 to 84 gr loads, with solids and softs in Hornady 500gr bullets , in my Ruger 1, 81 seems about right at 2150fps.