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In the past month ballistic calculations have been a huge topic of conversation between my hunting buddies and myself!!! I have worked up several different loads, researched many different bullet options, set up a mark 4 8.5x25 on my go to rifle and advised a friend on setting up his rifle for a sheep hunt... At any rate, we noticed that different ballistic comp programs would spit out different wind and and drop data when given the same inputs. After hours of research and problem solving it comes down to barametric pressure and bc being calculated in different ways... Word to the wise for those of you calculating your drops..... Be posssitive about how your bullet manufacture calculates the bc on your bullet ( g1 or g7), be sure that the program you use it set to the same bc, and make sure that the barametric pressure is measured in the same way from where you are abstaining your info and the program you enter it into! It will make a difference! That being said....... I am 90% sure that nosler lists their bc in g7 measurements, but I want to be sure. Can anyone verify this??? Thanks Whitey