It's simple, if the powder manufacturer doesn't have a recommendation for it, don't do it. Get the book or study the info produced by the people that know. Second hand or memorized info isn't worth your eyesight or possible injury. Cartridge Loads - Hodgdon Reloading Data Center - data.hodgdon.com

This site has all the info. Just follow through...you haven't said whether you're talking 4198 IMR or H...that's the first thing. They don't list it at all. That should tell you enough. Watch and shoot...