I ran into a couple of issues trying to get my sig 2400 abs to match strleok pro. here are corrections to pay attention to:drop due to wind correction and direction/azimuth match for spin of earth. wind correction is a big impact, i set wind to zero and 180 direction, make sure that is not goofing up or is off. strelok app has compass to match sig azimuth/compass, if you are not pointing in same direction on app compass, as the shot, it can be off. also, did you set your zero conditions correctly vs current conditions.