Keep the loads mild, for sure! Drillings are not strong like double rifles, and they shoot loose in a hurry, even with rather mild ammo. The older drillings werent designed to run "blue pills", and you'll be sorry you did when you send it off to the smith to be put back on face and re-regulated.

The 9,3X72R is essentialy a Nitro of BP loading today. This should tell you something in itself. Use soft 193gr bullets out the end at around 1,850-1,900 FPS. I load my dwindling supply of DAK 193gr .364 bullets with around 40+ gr of IMR 3031 and have gone to 43gr in some guns. When the clock hits 1,900 FPS I'm happy and stop there.