SU35,
Since you didn't list how what zero/scope height you used for your calculations, I ran JBM with Bryan Litz's BC's with a 100-yard zero, 1.5" scope height--and 5 mph 90-degree wind, and wind generally the real problem at extended ranges, not drop. Here's what resulted.
6.5mm 140 AB @ 3075:
157.4 inch drop at 800
26.1 inch wind drift
1625 fps
7mm 140 AB @ 3100:
163.4 inch drop at 800
29.1 inch wind drift
1537 fps
