Strelok Pro Questions

I am setting up a new M3 .30 cal 700mm sniper using fx hybrid slugs. Here is the following information that I can enter into Strelok Pro

Scope ATACR 7-35 F1

Height 2.86

Zero 40yards

length .420

diameter .30

weight 44.5

ballistic coefficient .102 (listed on fx website and some other places)

speed 973 fps

I sighted in at 40 yards, then again at 100 yards. My question is Strelok is saying 33 clicks(from 40 to 100) but my scope says 38 clicks. I must change my Ballistic Coefficient to .06

to get strelok to say 38 clicks. Is this the proper way to do this? 

Also using drag function GA. I tried different ones and it stays almost the same.