Tried putting the Halo LR on a couple bolt guns, and had some observations
I actually found that the bolt of a Christensen arms MPR (basically a rem700) would hit the ADM mount if I left it hanging off the rear of the rail at all. So either I had to push it back up until it was at least flush, or consider shorter throw bolt action.
Decided to put it in a fix rifle and that seems to work well.