I have been using .631 for years in 30-378's and many 300 win's. They all have worked out well to 1000 yards and have taken game with one shot.
Berger did change the BC at one time, I am not sure why, but they now have it back to .631 on there site for the Huntng 210 VLD as well as their 210 Target VLd.
Hunting_Bullets
Target_Bullets
But what ever....
Jeff
DUDE, you need to shoot more!! I bet you have a box that predates the BC revision, that's kinda sad, how you going to wear out a barrel at this rate