I shoot the 178 ELD-X outta my 300 win mag. The most accurate load I've found with great velocity is as follows: Hornady brass, Winchester WLRM primer, RL26 @76.5gn (3.5gn off max recommended load) COAL of 3.330, MVavg of 3203fps. Groups @ .5 with a 5 shots @200yd. No pressure signs, clean burn...