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Old February 12, 2010, 12:54 PM   #1
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9mm Bullet Through A .38 Special Bore?

Supposing all other factors (cylinder bore, pressure rating, etc) were acceptable, could a 9mm bullet be shot through a barrel bored for .38 Special?

And, if so, could it be "reasonably" accurate out to 15-25 yds.?
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Old February 12, 2010, 05:11 PM   #2
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Yes, to both questions. In theory, a .38 Special bullet is.357" and a 9mm Luger is .355, but people who insist on such precise figures have never heard of tolerances. I have loaded many rounds of .38 Special (and .357 Magnum) with 9mm Luger bullets and the only problem is that most 9mm factory bullets have no crimping groove so they need a tightly sized case to prevent bullet jump. Cast 9mm bullets have a groove, or at least mine do.

FWIW, Ruger made/makes a Blackhawk convertible in .357 and 9mm. Mine shoots fine with either.

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Old February 12, 2010, 05:39 PM   #3
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Yes. It will work just fine, but accuracy *may* suffer a little because the bullet is undersized (or it might not.) I bought a box of 9mm hollowpoint plated bullets and they wouldn't feed in my BHP (about every other one would hang on the feed ramp) So I used them to load .38 Special +P's and shot them in my Marlin carbine. They worked great, and accuracy was very good. I never tried them in a revolver.
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Old February 12, 2010, 06:38 PM   #4
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Ruger used to sell a Blackhawk with 2 cylinders - the normal .357 plus a 9mm cylinder.
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Old February 15, 2010, 02:53 PM   #5
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Dubious why?

one would wonder why, but I know why I did just that many years ago, mating a 9mm bullet in a 357 mag or a 38 special, makes the round a pretty awesome at penetrating metal, thin plate and aluminum are easily defeated. I use a taper crimping die. I no longer use a roll type crimp on handgun type ammo, the taper crimp eliminates multiple problems, with a some what heavy roll crimp it sometimes leaves a small roll or bulge around the case and sometimes that can lead to issues when loading. Second reason is I load tons of ammo for auto loading pistols and it is the bees knees... Mac

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