7x57R loads for drilling’s and BBF

I havent worked up a load with that light of a bullet yet, but I would use a powder with a good case fill like 4064 although varget worked for me too. 4064 is the largest grain and about the slowest powder I keep on hand.
 
Drilling is a double barrel shotgun with a rifle barrel between the 2 shotgun barrels ( on the bottom of the shotgun barrels)

BBF is a single shot shotgun over a single shot rifle barrel.

They are break open hunting guns from Germany. The case is the rimmed version of the 7-57.

4350
7828
7828sc
R22
R26
H4350
IMr 4831
H4831
 
I wish I had a BBF for coyote hunting my lazy butt always seem to leave the shotgun at home when I need it the most.
although 4064 has been great in my k98 I would stick with the slower powders you have on hand. Hodgdon has some data available online.