are you being sarcastic? Or is there a selection of 6+ BC 8mm boolets out there that I'm missing
Sierra has the 8mm 200gr Matchking, with a BC in the low .5's. Their 8mm 220 SBT is also in the low .5's.
In comparison, there is the .308" 215 Berger at BC .696. The 208 AMax at .648, the 210 Berger at .630.
I put some 215s through one of my 308s at 2600 fps, via moly, RL17, and a 26" bbl. It's a serious LR load in the 308.
If there is an 8mm LR bullet in that league, I'm not aware of it.