Though I have thought about H110/296 I haven't tried it yet. From what I've read, it's a full house load or nothing and the spread from start load to max is 1 grain in a 44mag and even less in a 357. I will try some in my 44 one of these days but the 357 is my wife's and I'd rather not set her up with full house type loads.
Now a question for you-----the 44 bullets I have on hand are 240 gr hard cast (no gas checks). With the load I'm using now (18.9 of N110) they average 1176 fps. I could try to push them a bit harder but don't want to get leading.
This is out of a S&W 629, 4.2". I just got it new a few weeks ago so haven't experimented much with it yet.
The last couple of 44's I had leaded pretty bad----one was terrible. I tried different powders, BHN's etc but it didn't matter. After 2 or 3 cylinders worth of shooting there was gobs of lead in the barrel.
The load stated above shoots well in this gun and is pretty clean.
Now I'm rambling but my question is, what is your choice of bullet in a 44---one that can be pushed hard, is accurate and would penetrate if you had to stop a bear?
Also, I googled hummason and see that they're in ON. I'm in BC so shipping might make that awful expensive powder.