Can a 9mm Blackhawk cylinder be bored to .357 Mag

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msc_8791

Bearcat
Joined
Mar 29, 2013
Messages
7
Im looking for an Old Model .357 blackhawk cylinder for a project without much success but have an extra 9mm one lying around. Is it possible to bore this one out to .357 dimensions? Im pretty sure the answer is yes but I thought i would ask the group.

Thanks in advance

Scott
 

ChiefTJS

Blackhawk
Joined
Dec 21, 2011
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854
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Nebraska
If I'm not mistaken the 9mm is larger at the base than the .357 so you'd end up with bulged brass on .357 rounds fired in it.
 

s4s4u

Hunter
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Dec 16, 2006
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MN, USA
ChiefTJS said:
If I'm not mistaken the 9mm is larger at the base than the .357 so you'd end up with bulged brass on .357 rounds fired in it.


That is correct, the 9mm case is .012" larger.
 

Ferdinand

Single-Sixer
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Sep 8, 2007
Messages
155
Location
Centerville, OH, USA
Rather than paying for the gunsmithing, it would likely make more sense to sell the 9mm to someone that wants it as it is - and it had a following. They buy a gun originally made as a .357 Mag. That's just my opinion.
 

Hondo44

Hawkeye
Joined
Apr 3, 2009
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People's Republik of California
Scott,

You don't need an OM 357 cylinder. The New Vaquero and Flat top Blackhawk 357 cylinders are the same as the OM 357. Same size and they will interchange.

Tell us about your project, what are you planning?
 

Chuck 100 yd

Hunter
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Mar 20, 2010
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Ridgefield WA
I also found the 9mm was .012" larger at the base the other day when trying a project.
I took a .38 special case and trimmed it to 9mm length to make a rimmed 9mm as an experiment. I have a bunch of .357311 (IIRC the number) Lyman bullets to use up but they wont fit the throats due to the full caliber front driving band. I guess I will have to use them up in .38/.357 loads.
 

Hondo44

Hawkeye
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Apr 3, 2009
Messages
8,061
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People's Republik of California
Chuck 100 yd said:
I also found the 9mm was .012" larger at the base the other day when trying a project.
I took a .38 special case and trimmed it to 9mm length to make a rimmed 9mm as an experiment. I have a bunch of .357311 (IIRC the number) Lyman bullets to use up but they wont fit the throats due to the full caliber front driving band. I guess I will have to use them up in .38/.357 loads.

Chuck,

Great idea, and I don't see a problem with it. Once the shortened .38 cases are fire formed to the 9MM chambers, just resize and reload them with 9MM dies. You're good to go! A new cartridge; the "9MM Rimmed".
 

damienph

Bearcat
Joined
Aug 8, 2011
Messages
45
Location
Kansas
Hondo44 said:
Once the shortened .38 cases are fire formed to the 9MM chambers, just resize and reload them with 9MM dies. You're good to go! A new cartridge; the "9MM Rimmed".
Hmm... Sort of like the 9MM Federal.... :)
 

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