I consider a bc over .500 for many bullets I use as acceptable and over .600 as high. For example, the .308 180 grain Accubond has a bc of .507 which is acceptable. A 140 grain .270 bullet is acceptable to me if the bc is over .500 such as the TGK and Berger, the Badlands 140 has a .650 bc which is high. The 100 grain 6mm TGK has an acceptable bc of .515, whereas the Badlands 100 grain 6mm has a high bc of .600. A 225 grain .338 TTSX at .514 bc is acceptable and a 225 E-tip in .338 at around .600 is high. But of course, the heavier for caliber the bullet is, the higher the bc it needs to have to be "high" or "acceptable" for example a 175 grain .277 bullet with a bc of just over .500 isn't acceptable to me.
