A rifle that shoots sub half minute at 100yds may shoot 2 or 3 minutes at 1000yds and a rifle that shoots sub half minutes at 1000 yds may not shoot better than 2 or 3 minutes at 100yds. The pain of long distance shooting starts at 25 yds to be on paper then moves back to the range required testing and tuning all the way. Son is right it only takes something very small to upset the best plans to achieve the dream.