Test for true BC\'s I was wondering if this would work..... 1. Zero Rifle for 100 Yards 2. Shoot for center of 100, 200, 300 & 400 Yard Targets. 3. Measure Muzzle Velocity while doing so. 4. Measure the drops. 5. Put MV and stated BC into ballistic program then keep adjusting BC until the ballistics program matches my actual drops. Would this be an accurate way to determine true BC? Also, would my drop charts be accurate past the ranges I shot? (in this case 400 yards) Or, would the BC change from the bullet slowing down?