Been working for years with g1 and jbm via excel. Downloaded bullet flight last month and got pretty impresive results. Downloaded ballistics and tried g7 bc. with two different bullets on three extremely different days i got amazing results. 120 tsx 6.5mm and 150 ttsx in .308. Shot both from 100 to 1000 using bc derived from ballistics (jbm iphone) interpolated with bullet flight. daggum have I been stupid. No drop was less than 1.5" from predicted. My intermeddiate ranges actually line up and i was able to use shot fps with no adjustment. I used to have to adjust via stock table and was pretty close. Now i am able to get atmospheric conditions, dial and shoot. 40 degree temp swings and 70 to 100 in humidity, it actually adjusts. You may want to try it if you haven't already. Thank you Eric on the g7 work!