deercutter,
I have shot 150grs. 777 in my Encore and Omega with very good results using 3oogr. Barnes MZ's or the 289gr. Remington Copper Solid bullet.
I only get average accuracy using 150gr loads of 777 when I use lighter pistol bullet/sabot combinations.
I have never chronographed these loads and they do kick quite a bit, so if you are recoil sensitive I would most definetly reduce my powder charges.
You do get more fouling using 150grs of 777, but I always clean with a dampened spit patch between shots.
If you want to duplicate the load that you are currently using, go by what lonewolf says. Reduce by 10-15%
Good shooting and keep it in the 10x
mac454