Sig Sauer Ballistic Library...where are they getting BCs?

[Str8shooter]

Wondering if anyone can let me know about the apparent discrepancy between the some G1 BCs listed in the Sig BC Library (accessed in the BDX app for use in the kilo 1800) vs the manufactures published BC... For example Sig suggests that the G1 BC for a Barnes 150 grain TTSX in .308 is 0.387 vs Barnes website which says 0.42... Im inclined to disbelieve the barnes published values given some publications regarding overestimates Ive read, but trying to confirm how Sig got theirs (they have both a G7 and G1 for multiple bullets) with little luck.. Thanks

 

[bradb]

The sig uses AB for the ballistics. AB and the Litz team are very good. Manufacturers have had a tendancey to stretch theirs. The sig has been spot on. I use G7