I havent noticed any real accuracy changes to speak of. Most of the shooting I have been doing has been in a tough wind, so most of my groups have been a bit more open than normal at longer ranges. The times I have shot them at 300 yards with dead still air, I may have seen an ever so slight increase in accuracy but I wouldnt read into that too much with the minimal time I have been able to shoot in dead air at 300 yards.
Bear in mind I didnt just uniform the meplats, I opened up the hollow point by 100%. I am sure this is where most of the BC loss is coming from.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.