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Originally Posted by Por_sha911
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Thank you - that's quite interesting.
So, the .38 Special / .357 mag and the .380 ACP / 9mm are dimensionally close enough to be used in the same cylinder and fired down the same bore. Ruger, for example, makes a 9mm cylinder for their .357 mag Blackhawk. It works o.k., even though the auto pistol bullets are smaller in diameter.
Where this thing goes haywire is with the inclusion of the old .38 S&W. It is dimensionally different enough than the later .38 Special and .357 mag that it really is dangerous to fire the latter two in guns so chambered. Lots of shooters have been injured trying. So, if the chambers are indeed big enough to accept this round, it would be quite dangerous to use any of the others.