I recently bought a pair of Leica hdb binoculars. In the process of setting them up with the custom load data on the memory card. When I look at leicas ballistic calculator I notice there is no way to in put atmospheric data. It just says at the bottom that the chart will be based on 30.24 inhg. My question is, do I need to go shooting, gather my data(velocity, atmosph pressure, temp, elev) then take those numbers, put them in shooter and convert them to 30.24inhg, then plug the corrected numbers into the Leica program?