Anyone?

[Ridge Runner]

yesterday I finaly got some more time so I loaded up the 6.5 and the 7 AM, and headed out. I wanted to start tweaking my drop chart for my 6.5 since switching to 140 bergers. well they are running 3250 fps, published BC of .64, I set my target up on a large pile of topsoil and drove to an adjacent field.
Range was 834 yards, exbal said I needed 12.5 MOA to make zero, there was a 7mph constantly switching wind that I just said the heck with and let her rip.
I fired 3 shots, the group was centered on the target 11" high, hor. dispecion was about 12" vert was 2". so doing the mathits seems to me that I need to change my BC to around .8 to make the trajectory match my charts< seems high to me, what do you think big?
RR