Re: ballistic coefficient questions . 6.5 mm bullets
If you decide to go with bullets in the 130g weight range, the Hornady 6.5 bullets in that weight range are a good choice. The 129g SST's are inexpensive to shoot and can be reserved for use at longer ranges where their frangibility is an asset because of lower impact velocities. Hornady also offers the 129g Interbond, which would give you the option to use the tougher bullet at shorter range.
The bc for the two bullets is identical. Given careful load development, I would expect the two bullets to have similar POI's. It could be a useful pairing. I just wish Hornady would do something similar in the 140g range to offer a tougher bullet to pair with the 140g AMAX.
In my faster 6.5's, I am pairing the AMAX with Partitions. In my Swedes, I am using Bergers. I don't think they are fast enough to really need a tougher bullet.