Pglasgow
Can not tell you much about your numbers... but when the 460NE is shot through a chrono at the muzzle and another @ 100 yards - the BC computes out to .202 as fired by "Big 6x6." Do not know if that will make any difference in your calculation....
Today I picked four represenative conicals to calculate the BC. The BC is the average of three shots fired thru two ProChrono chronographs simultaneously that were 100yds apart for each bullet. All calculations were done with Load from a Disk Version 4.0. The charge was always 80gr fffg Triple Se7en used in each of two White Rifles 97s.
.451s
Bullshop 420gr- 0.268
No Excuses 495gr- 0.326
.504s
Bobs NEW 496gr- 0.241
No Excuses 460gr- 0.202
These BCs are dedicated to Underclocked! 