The reports seem to be promising to put it mildly in some cases with the right loads and with the shooter doing their part (sub-MOA), but somewhat disappointing in others (2MOA). Remember...the MR762's close cousin...the HK 417...FAILED the accuracy testing undertaken for the Germany Army SASS-DMR trials (NOT a good sign at all). Now, by all intents and purposes and from what I have seen and read, the MR762 is SUPPOSED to be an improvement over the 417 in both reliability and accuracy, but only time and shooters like you, samnev, will tell!!
Here is just one of many HKPro accuracy "reports" of the rifle in question:
MR762 with Nightforce 3.5-15