The 12 pt. muley was standing ,I gussed 42 yards broadside, up hill,looking down @ me ,,settled the 40 yrd. pin on him ,released ,to darnlow!!! [] seen the arrow smash into the rock [:@] what the heck...guess I need more yrd. estimate courses or some tech advice here ! Whats the best way to calulate distance ,up hill ,down flat .etc..?????...