Has anyone shot this bullet at long distances (600 to 800 yards) and computed an accurate BC? The Barnes website lists it as .336, while the Weatherby Ammunition website page lists it as .42. That's a pretty big difference. I want to develop accurate drop charts for my .257 Weatherby. The 100 grain TSX is shooting right at 3600 ft/second out of my rifle. Of course I would need to validate any data with my own gun and ammunition, but anyone with good data would help get me started. Thanks!