Maybe a few others can chime in here, but I have found the 155 scenar to be closer to .490 in BC. (?) I believe it was first marketed at .508 but field testing and (I think) Litz's write up knocked it down a bit.
I have shot the 155 in 4 different 308's and two '06's and over, say the 165/168 BT, I enjoy the BC, ease of accuracy and (slightly) lower recoil of the 155.
"You know why nobody panic buys 30-06 ammo? ... Because men with 30-06's don't panic"
