I just put put a few rounds with 2400 (17.5gr & 18gr behind a 245gr JHP) through one of those this last weekend out in the woods. Shot really nice, but haven't tried any accuracy testing yet. At this point I think I like 2400 better than Unique or H110 for 44 mag, but next time at the range will tell the story.
I thought I'd add that the Lyman #48 manual has their bullet #429421 (245gr linotype) listed as a Keith Elmer design (the bullet for 44 mag, supposedly), with 2400 @ 20.6gr listed as potentially the most accurate load. The starting load is 18.5gr, 20.6gr is the max load they have listed for this bullet.