Don't know what powders you have access to, but here's some good accurate loads out of my 629 6". All powder coated cast bullets from Lee molds.

44Mag: 21.6 gr IMR4227 under 250 gr LRN2R 1190 ft/s

44Sp: 6 gr CFE Pistol under 200 gr LRNFP 1035 ft/s
5.9 gr Trail Boss under 200 gr LRNFP 890 ft/s very accurate
5.5 gr W231 under 250 gr LRN2R 800 ft/s

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What could possibly go wrong?