Here is recent data with a 65g vmax w/my 6x45 & 6x6.8
These are out of a 22" BHW bbl and suppressed, not sure how they would actually go in a 12.5" bbl.
6x45, 65vmax, 3253 fps.
6x6.8, 65vmax, 3430 fps,(I could go up at least another 2g powder here)
The 6x6.8 65g vm load was not a max load either
55g loads
6x45, 55 nbt & 55g varmageddon, 3329 fps
6x6.8, 55 nbt & 55g varmageddon, 3675 fps ( can go up at least 3g more here)
Both rifles shoot the above bullets identically in groups and speed using the same load of course.
These are out of a 22" BHW bbl and suppressed, not sure how they would actually go in a 12.5" bbl.
6x45, 65vmax, 3253 fps.
6x6.8, 65vmax, 3430 fps,(I could go up at least another 2g powder here)
The 6x6.8 65g vm load was not a max load either
55g loads
6x45, 55 nbt & 55g varmageddon, 3329 fps
6x6.8, 55 nbt & 55g varmageddon, 3675 fps ( can go up at least 3g more here)
Both rifles shoot the above bullets identically in groups and speed using the same load of course.