u/NewMexicoDreaming

So I've been wondering something. I'm still new to loading so help me out..
As an example I shoot 110g Barnes ttsx with H4350 which Barnes lists as a powder. Now if I reference the Hodgdon 2026 reloading manual or any burn rate chart I suppose they give you relative burn rates of different powders. How do I know if I can substitute the next up or down powder? Does it specifically have to be a listed powder?