Here's my response and you're not going to like it......
None of the above.
.649 is on the old box. .617 is the new value based on more intensive work that Berger is doing.
These values for for Joe run of the mill read the box value load, zero at a distance, run a computer program to develop a drop chart then go find stuff with hair on it.........
For LRH purposes one of the published values can be used to get a start. Do wat Joe run of the mill does then go shoot at distances and work up your own drop chart for that bullet, powder, case, primer and rifle.
You'll learn that several values will require tweaking:
1) Line of site above line of bore.
2) If you have a chrono then tweaking to get very low velocity spreads is required.
3) If you don't have a chrono things take a bit longer.
4) BC value. It'll change for various environmental conditions.
5) BC value. It'll change with changes in elevation.
Also it helps to do all of this shooting on flat ground. Not shooting up or shooting down.
Once you get all of that done, you'll be able clearly state what the BC is of the bullet you are shooting with that specific load in that particular rifle.
Hope that wasn't TMI.........
If you are interested in comparing BCs for the sake of finding higher BCs, any thing over 0.6 is good. Around .7 is great. Over 0.76 is to die for.