I shot my Black Diamond XR 45 for the first time this evening, using those 460gr NoExcuses and I must say I'm pretty impressed. I used your load of 85gr as a starting point and got a 1 1/2 group @ 50 yds with open sights. Out of the 5 shots, one was a flyer but it was only out by 2 inches. If I have time tomorrow I'll zero it in play with the charge some to tighten that group up a bit.
Have you tried a wonder wad with these yet?