Go with the .44 mag the 44/40 doesn't do well with bullets not designed for it, To keep the blast down use fast pistol/shot gun powder like AS30 Trail Boss is not happy
with heavy bullets AP70 is as slow as you should go in burning rate, Some of the guys on here use my cast bullets the mould I use is from http://www.mp-molds.com/index.php?pr=Molds
No 432-640 you get a FP and two HP pins my bullets are 280 270 260 grains Cast them as soft as possible and use a good lube not the Lee stuff, Check out Cast Bullet Engineering in Aussie
they make excellent moulds, go for the wide flat nose type and don't worry about gas checks not really needed under 1500fps.
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