I have shot BH ever since it came out, I normally do not shoot anything else in the Omega ,Triumph or Endeavor. I have noticed that the first two shots on the range will be out on the edge or even a bit father off the normal POI, but it does not sound like that is what you are talking about. I avoid that situation while hunting as I have figured out a procedure [kind of long drawn out ] that eliminates that problem for hunting. Other than that I have shot as many as 50 shots with out any change as long as the carbon is cleaned out of my modded BP every 20 shots, when using an unmodded BP I have to clean every 8 or 9 shots to keep the POI exact.