With the exception of the BP models, the unshaved big bores ought to be fine with the .455 MkII ammo available from Hornady and Fiocchi (the Fiocchi is reputed to be hotter). .45 ACP or AR ought to be downloaded in the shaved versions.
The WWII era .38s are fine with .38 S&W straight out of the box. Factory stuff tends to shoot a bit low though. Earlier models of .38s are a species unto themselves, and I'm not at all familiar with them.
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