Loading black powder rounds

[dieNusse1]

I am loading blackpowder in both 45 LC and 44-40 for my 1875s and 1858 conversations. I know it's not good to have a void in a muzzle loader. Question: can I leave a void in the brass or should I fill the void with corn meal or something similar before setting the bullet?

[dpg06va]

I shoot black powder rounds in my M1875s in 44-40. I use way less than 40grs and a light bullet.
Powder: 3fg Goex (shoots cleaner than 2fg), 25 gr. by weight
Quaker "Quick Grits": fill to just below rim of cartridge
Bullet: Black Rock Cowboy 200 gr, .428" marked, run through a .427" sizer
Enjoy!!