I have 700 SPS 300 RUM w/Pac-nor 28" #5 w/timed break and bolt trued. I loaded ELD-X 212gr setted at 3.64", 83.0 thru 85.0gr of IMR 7828SSC and CCI 250 primers. The 85.0gr grouped at 0.3" at 100yds and chronied at 3178 fsp. I was hoping to get 2970 fps like the Hornady book stated. Hope this helps you with developing and load.I was using 96 grains of R33 in Norma cases for 3140fps average SD of 7 from a 27" pac-nor with the 212ELD-X. I couldn't get them to group for me so I switched bullets. I have a bunch I'm sitting on and might get them to shoot with another powder.
Reuben