RE: BC for the 277 cal bullet
Like has been said unless you are actually shooting beyond 500 yards it isn't going to make any real world difference at all.
But to answer your question... the published BC's for 130 grain .277" bullets are as follows from highest to lowest.
Hornady SST and Interbond - .460
Berger VLD hunting - .452
Speer BTSP - .449
Sierra Game King - .436
Nosler Accubond - .435
Barnes TSX - .431
Now keep in mind that the BC will change as velocity changes.