Dave - I have a GM LRH barrel on my Renegade and I shoot 80 gr of Pyro P and 200 gr .400" XTPs with the blue Harvester EZ load sabots. That was the load I used in this last time and it shoot good in this rifle too.
I had a bunch of these 150 gr Nosler .400" bullets laying around so I thought I'd experiment with the lighter loads and see how it shoots. I was impressed to see that out at 100 yds there is only about a 2" or less drop than at 50 yds. (Check out the very right dot where I made the sight adjustment at 50 yds - Its just below center with a 6 oclock hold on the dot - so about an inch high). At 100 yds, holding at 6 oclock on the 1" orange dot the center of the group is only about an inch low and an inch right. And recoil is almost nonexistant.