My first post. I averaged all my prior hunts were animal were taken, elevation, temp with a look at bar. pressure and humidity. So why not set my new hunt rifle with a zero for the averages of elevation of 7200 ft and temp of 45 degrees utilizing a trusted ballistic cal. with all normal input bullet bc, twist rate, muzzle vel (ft/s)......etc. pros and cons Thanks in advance and for a fantastic website.