Re: 140g Abond vs 140 Berger VLD
Regarding the discrepancy between the bc's of the two bullets, Berger tends to be more accurate in their data than Nosler. You can see for yourself that Nosler's bc info is probably a bit optomistic.
The various 4350's are pretty close in burn rate. Close enough that they can even swap places relative to one another in different applications and different conditions or even among different lot numbers.
For a starting load, I don't see a problem with substituting data between them. The MAX load is where you may see a difference, so approach the top end with some caution. The same will be true using different bullets of the same weight.