While I don't have a 3" barreled 44Mag, I've found that Blue Dot is an excellent powder for a 4" 629 Mountain Gun. Like another poster said, you will still get more velocity with a slower powder like H-110, but the blast and flash is ridiculous for a small gain in velocity. A 250gr. Keith clocks around 1175 fps out of my MG when fueled by Blue Dot. I consider this a mid-power 44Mag loading, but it is very accurate in my gun.
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