I have just been playing a bit more with QL and used Dr. Howells excellent how to to find the best powders for my 6x47 with the 70grNBT.
I've been using BL-C2 but based upon the suggestions from QL I'll be picking up bottles of Ramshot X-Terminator, Norma 200, H335, Accurate 2200, and RL7.
My BL-C2 loads clocked within 15 fps of predictions so I hope these others do the same.
Seems I'm leaving close to 250fps on the table with the BL-C2!
Hope my chronograph confirms same because the 70gr NBT at 3250 or so should be murderous on whitetail!