With all due respect to the previous post.
1. BP does not HAVE to be dropped through a drop tube. It will allow more powder and better "stacking" of the grains. But this only really matters in long cases like 45-70, -100, and such. It is not at all needed in a 56-50.
2. BP does do well with compression. Many BPCR shooters, to include myself, use a compression die with BP. Slight compression when seating the bullet is fine for a 56-50.
Really with the smaller calibers like the 56-50, just a full case of BP with slight compression from bullet seating, or even a bit lighter load with some corn meal filler will yield good results. An appropriate bullet for BP with good deep grease grooves is the most important.
Drop tubes and compression dies are a waist of time with the 56-50.
Buy American, shoot Goex.
-Ed