Some commercial brands of cast 9mm bullets are sized .357. These would work in the 38 spl casing.
FWIW, I cast my own bullets. I use the same bullet, sized .357 for both the 9mm and 38/357.
If you use an auto bullet in a revolver case, it won't have a crimp groove. You would then crimp it at the very front of the top driving band.
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johnnyb
A slow hit beats a fast miss.
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