I use it in my 45-70 levergun and have plenty of it. Well, I was looking at an old Lee load kit for my 44mag and the data was printed in 1963. Low and behold they have an load for the 44mag using IMR4198. I could find it in anybody my old Speer or new manuals I have now the Lyman cast book.

This may not be the ideal nor best powder but if it works and a person has some why not use it? So would that be a go or no? It might be ok as it's primary use is an Marlin 1894 SBL.