Originally Posted by P KUNDA
Every bullet has different BC at different velocity. (look at Sierra website) I would even go as far as saying, that any bullet fired in a different barrel/twist has its own BC. that will differ from a published data and will be changing differently with downrange velocity.
Thanks for the answer and I have spent many hours on the Sierra website over the years, but this is beyond what they offer especially since it is not one of their bullets.
You are correct about all of the factors (temp, altitude, speed, twist rate, bullet engraving depth etc) affecting the BC . But maybe you misunderstood the question. I was just wondering what the ballpark average BC would be (from the muzzle to say 1000 yards) with a 3100 fps initial velocity in the gun I tested it in when I got the .770 assuming I changed altitudes from 92 feet to the ones I had listed above and basically kept the same initial velocity + or - a few fps.
I thought you all may have a function that did it in one of those pocket brains that have the different ballistic programs loaded.