fusion,
Do you know what velocity you're getting with that load? IMR-4759 is a little quicker burning than AA-5744. I haven't really had any problems with the 5744 being too dirty. I can shoot all day without swabbing and still see bare stainless steel in the bore. I like 5744 because it's got 20% nitroglycerine, making it really easy to light off in cold weather, and gives really consistent results. I wouldn't mind trying something different, but I still have so much 5744 left I don't know what I'd do with it. The great thing about the Savage is that it takes a long time (for me) to use up a pound of powder. Cheap... just the way I like it!
Mike