I went with a .430 sizer when I first got into reloading and the bullets it sized worked fine in all my .44 revolvers. I'm sure a .431 would work fine too. I think knowing what I know now, I'd probably get a .431 sizer instead because the .430 distorts some of my bullets a little more than I like.
Naturally, as you indicate, the best thing is to slug the bore and throats of all your revolvers and that way you'll know just exactly what they would prefer.
Mike
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