Re: What does everyone think about Barrett B.O.R??
I've never run the Nightforce version, so I'm not aware of specific differences. The Exbal version does have both windage and target lead adjustments, and the bullet BCs are being updated.
For example, the version I'm running has the BCs for the .308 Sierra 155 grain Palma Matchking, which is a relatively new bullet - it came out last year. That particular bullet has BCs in four velocity ranges.
However, manufacturer's BCs are notoriously optimistic. I find that I have better results if I use Bryan Litz's BCs.
For example, if I use Bryan's G1 BC for that bullet in Exbal, the result under the same conditions for a 1000 yard shot agrees closely with the G7 calculation in the Berger Ballistics program which Bryan wrote.
Prior to getting access to Bryan's BCs, I had to adjust the BCs in most ballistic programs to get them to match my field shooting results, which was the only method I had for validating BCs.