Anyone here familiar with this rangefinder? Question I have- I'm running factory Horandy 147g ELD Match in 6.5c. Horndy's site states that round's BC is G1=.697 G7=.351 But on my Sig app... in the bullet library.. It has that bullet's BC showing to be G1=.654 G7=.335 Why the discrepancy? Can anyone shed some light? I've done some searching but haven't found the answer. I thought I'd ask here before I call Sig.