I have the same gun in 7-08 and was getting poor groups when I first shot it (groups opened up after a couple of shots). I followed SAS's advice and this is what I did to get it to shoot:
-checked for binding in the mag box (none)
-checked clearance of the floated barrel. I had to open up the channel a bit to relieve a tight spot.
-bedded the recoil lug tight and drimmeled out underneath
-fully floated back to the recoil lug
-the crown was really rough. had it touched up
-replaced the front guard screw with a longer one to give me about three more threads.
I've only worked up loads for three bullets with RL-15 (120 bt, 140 bt and 140 nab) all shoot great; especially the 120's and 140 NAB.
These groups are at 50 yds (all I had access too at the time). I just wanted to compare 140 NAB and 140 BT with the same load and to see if the groups opened up after repeated firing. I shot three on the left, let rest for about 5 minutes then three on the right and continued for a 9 shot group. The last 5 (upper left were in the same cluster with a hot barrel)