For my Shiloh's in 45 and 40 cal. I use 30-1. My 50's like a 35-1 (50/70)
The 50/90 is partial to 20-1, and the trapdoors like 20-1. It's not hard to alloy different batches. Just do your range "homework" and you'll find what is best for your rifle(s).
Good luck
Al