I do believe I have unraveled at least part of the mystery.... After getting such exceptional accuracy with it under the 85s and thinking through Keith's comment that I'd merely not found the right load I tested 100 gr CLs w/ RL17 and VOILA!!
Hopin like crazy the same thing happens with the 95 gr NBTs!!!!
Good deal- I kind of figured you might! Good job. Nothing wrong with 100 grain corelokts. Still a bit surprised it was so finicky- aren't you?