I hunt over some pretty long fields in NC and I've never used one. If a deer is well over 300 yds, I just show a wee bit of daylight under the horizontal crosshair, and my bullets do just fine. Popped two doe deer that way one afternoon last fall with my 270. Unless everything is perfect, I don't take that type of shot. I'd rather have a good range finder to know the yardage. Might ask the kids to give me one for Christmas.