9mm - .357


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taxifolia
July 6, 2010, 12:38 PM
My neighbor recently purchased used New Model Blackhawk (.357 / 9mm dual cylinder). Someone told him 9mm bullet would "wobble" thru and damage the (.357) barrel.

I computed 9mm = 0.35433. Is there any validity to the "wobble" issue ?

Thanks.

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WC145
July 6, 2010, 12:53 PM
NO! That .002" difference in bullet size isn't enough to be any kind of issue and shooting 9mm out of it will not hurt the gun or barrel in any way.

Besides, would Ruger sell a self-damaging gun? I think not.

BullfrogKen
July 6, 2010, 09:10 PM
That's nonsense.

The most he might see is some reduced accuracy, with the 9mm projective not fully engaging the rifling. But it certainly won't damage the gun.


It's tight enough that a 9mm bullet won't even drop through the barrel on it's own if you tried. You'd have to start it centered, and still need to give it a shove with a rod - if you could start a rod down the breech end of a revolver.

PO2Hammer
July 6, 2010, 11:14 PM
It's only .001" difference at any point on the bullet.
I had that gun a few years back and the 9mm cylinder worked pretty darn well. I could get 3-4 inch groups at 25 yards with 9mm ball ammo.
I's a good deal, especially for the non-handloader.

918v
July 6, 2010, 11:19 PM
One of my Beretta M9's had a .358" groove diameter and a .360" throat. The other hed a .3575" groove diameter and a .359" throat. Both of my Sig P210's have .357" groove diameters.

Ruger's .357" groove diameter seems to be on the tight side for the 9mm.

PO2Hammer
July 7, 2010, 02:25 AM
Also if you look at Cimmaron's (Uberti)website, they list their .357 magnums as having .355" groove diameters, so there's a lot of variation out there, and bullets generally tolerate it well.
.355" lead bullets may not do well in a .357" bore if the rifling is shallow, but jacketed bullets will tolerate the variations.

FTSESQ
July 7, 2010, 02:33 AM
As others have said, no, the difference is so nominal that it will not make a difference

William Lee
July 8, 2010, 03:17 PM
The loss of accuracy, if any, is more likely due to the greater distance a 9mm bullet needs to travel from chamber to forcing cone on a revolver compared to .357 or even .38 special, not the difference in bullet diameter.

Sniper X
July 8, 2010, 04:49 PM
I just love hearing these stories about these supposed PROS who say stupid stuff like that...:what: As others said, that gun was designed to shoot both so no it won't hurt anything....

Meeteetse
July 9, 2010, 01:01 AM
I'm happy to know that I haven't ruined my BH .357/9mm and BH .45Colt/.45acp shooting them for the last 35 years. All that cheap 9mm and 45acp ball ammo might have gone to waste if I had known there was a problem. . . . . . I just wish I could buy more cylinders for my other caliber specific guns. :) :)

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