I have a load worked up for my 300 Win Mag using the 180 Barnes TSX. From a zero of 250 yards I had to go up 102 clicks to be rezeroed at 965 yards. This was a bit crude but it shows the BC to be more like 0.410 rather than 0.55 which is what Barnes has published. I had thought earlier that the BC would be 0.510 based on some I had done out to 600 yards but adding another 365 yards gave me much more drop than expected. The only way the drop makes sense is if the BC is much lower than I had thought. Have any of you done more extensive testing than I on this bullet to establish the true BC? Thanks, Rufous.