If you know 50 yds is your max distance, pace off the 50 yd, shoot 3 rounds into a good size chunk of firewood with a black dot in the center, and if you are within 2" of center, you are set. Aim dead center in lungs area (see http://www.deerhuntingbasics.com/ima...ement-500B.jpg ) and with that 30-06 that deer will be down for the count.