When utilizing the on Line JBM ballistics calculator for one of my bullet/speed combinations (300 WSM - 175 gr JLK) the results show -223.7 at 1000 yds when you input -30 degrees for shooting downhill and -219.9 at 1000 yds when you input 30 degrees for shooting uphill or 3.8 inches difference. With another software the difference was 4.4 inches for the same load. The ballistic software that is sold by Night force does not allow you to input a negative number for shooting downhill. This software only allows apositive number for degrees. Gerald Perry who wrote the NIghtforce software says that the point of impact is the same for uphill and downhill shooting. Can anyone shed some light on this? Does shooting uphill vs shooting downhill result in a difference in the required drops?