You got 2400, use it. Worked fine for me in a couple of .44 Special Charter Bulldogs w/3" barrels. Your short barrel is going to limit velocity, anyway, so I would not bother with full magnum loads. A 240 grain LSWC at about 1000 fps will do anything I am going to try to do with a 3" barrel. It's also about all I can handle in fast double action. Try something in the 16-18 grains of 2400 range and see how you like it.
Your Brazilian powder numbers mean nothing to me, but if one or both fall between Unique and 2400, it's worth a try.
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