In the past when I loaded 5 in 1 brass to make blanks here are the steps I used.
1. prime case
2. add powder
3. add foam rope wad about a quarter in thick to keep the powder in
4. Crimp the case about 2/3s the way closed. I did not want to crimp all the way close creating a point, a bad thing in a tubular magazine.
5. run finished round into the .44-40 size die from my loading set for live ammo.
This is what has worked for me in the past. Today I use .44 magnum brass with a modified carrier block.