Hey, a few more data points I pulled from my Berger manual (1st edition). I don't have any data listed for the 64 BR Column but I have some info on the 60 and 65gr projectiles
60gr FB Varmint: With N133, the powder charge ranges from 26.0gr to 28.9gr. They achieved a velocity range of 3042fps @ 26gr to 3356fps @ 28.9gr out of a 24" barrel with a 2.193" COAL.
For the 65gr they list the same data for the 65gr FB target as well as the BT target. With N133 the charge ranges from 24.5gr to 27.2gr, getting velocities ranging from 2978-3297fps out of a 24" pipe, with the COAL again at 2.193".
I'm guessing the 65 gr load data would proabably be a better starting point of the 2 that I listed listed.
Best of luck, and reload safely!