Don't get too caught up in the size of cylinder throats being oversize . It's the " groove " size of the barrel that is important . If the cylinder throats are smaller than the groove size of the barrel , then you have a problem .
I would buy cast bullets sized .431 . I'm not familiar with your powders . I use Winchester Super Target for my target loads in 44's . It burns very clean and shoots accurately . I use the " real " Keith 245 gr swc , HG 503 in my 44 special and 44 magnums .
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