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Ammo and Reloading Factory Ammunition, Reloading, Components, Load Data and more.

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  #1  
Old 04-24-2011, 10:16 PM
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Default Firing 9mm bullets out of a .357 magnum?

Anyone ever try this? it must be possible, the difference in diameter is like .001 of a mm.
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  #2  
Old 04-24-2011, 10:19 PM
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.357 sig, all day long
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  #3  
Old 04-24-2011, 10:39 PM
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.001 inch difference not mm. It will work, accuracy will not be good.
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Old 04-24-2011, 10:51 PM
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Quote:
Originally Posted by tzahoy View Post
.001 inch difference not mm. It will work, accuracy will not be good.
Lol my bad, If the acuracy is that bad im not gonna mess with it, just thought they were similar enought to be interchangeable
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Old 04-24-2011, 11:04 PM
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I would give some a try -- sort of depends on your actual bore diameter -

They work fine is my 38spl but are too small for the 38S&W - I use 356402
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Old 04-24-2011, 11:06 PM
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If you mean .357 Magnum, then no, the 9mm bullets are too small. If you mean .357 SIG, then yes, because despite the "357" designation, .357 SIG actually uses a .355" bullet, just like 9mm.
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  #7  
Old 04-25-2011, 1:06 AM
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The accuracy will be no different than with .357" bullets. Consider that a Beretta M9 has a .357" bore yet is very accurate with .355" bullets. The only problem is a lack of a cannelure so you will have to seat deeper and crimp over the shoulder.
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Old 04-26-2011, 12:53 AM
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Search online for opinions on the Ruger Blackhawk 357/9mm convertible. There's no consensus on accuracy, but mine seems plenty accurate.
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Old 04-26-2011, 4:15 AM
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I've tried it. It works but never check the accuracy. I only loaded 3 rounds.
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Old 04-27-2011, 1:44 PM
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Here's why I wouldn't do it. I've tried 0.450" cast boolits in my SRH 454, which has a 0.451" barrel. Precision was terrible unless I had enough pressure behind the boolit to obturate it into the chamber and rifling. But if I do have that pressure and resulting obturation, precision is great.

If you use 0.355" bullets in your .357 Magnum, make sure that it's reasonably soft lead. I would suggest an absolute maximum hardness of BHN 16 for the standard .357M load, and BHN 12-13 isn't too soft for this. That soft lead is what's going to save you.
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Old 04-27-2011, 4:19 PM
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A 9mm is a different animal than a .454 Cassull. Most 9mm pistols do not have .355" bores.
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Old 04-27-2011, 8:19 PM
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Whatever you do, always keep in mind that a couple thousandths of an inch can mean life or death when it comes to reloading ammunition.
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Old 04-27-2011, 9:40 PM
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No. The bore and groove tolerances are a couple thousandths of an inch. By your standard, firing factory ammo through a factory pistol can men life or death.
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Old 04-28-2011, 7:41 AM
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I said can. And I was referring to reloading practices in general. Such as an untrimmed rifle case a couple thousandths too long can cause a catastrophic failure. The guy doesn't sound like an experienced loader, so I was just throwing that out there as a precaution when thinking about experimenting. Which I thought was rather obvious in my post, but I guess some would rather argue and throw lame put downs than take a moment to think about what they just read.
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Old 04-28-2011, 7:49 AM
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Darawism at work

Last edited by ubet; 04-28-2011 at 7:51 AM..
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  #16  
Old 04-28-2011, 8:01 AM
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Do it, video tape it and put it on Youtube for all of us to see.
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Old 04-28-2011, 8:44 AM
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I've done it... it works ok.. you can really push an 88 gr HP to crazy velocity out of a 6" 357 magnum with a hefty charge of Blue dot.. accuracy sucked, but the fireball was impressive. If it was my only choice I'd do it, but otherwise I try to use the correct size.. the issue I had at the time was that I needed to use a 9mm sizing die to secure the undersized bullet in the 357 magnum brass.. I think I sized about .100" of the 357 brass with it to get enough neck tension to hold the bullet.
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  #18  
Old 04-28-2011, 2:26 PM
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Quote:
Originally Posted by J-cat View Post
A 9mm is a different animal than a .454 Cassull. Most 9mm pistols do not have .355" bores.
Laws of physics are laws of physics and thus apply regardless of the cartridge. That's what I was talking about.
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Old 04-28-2011, 3:20 PM
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In the context of this thread, there is nothing unsafe or detrimental about using 9mm bullets in a .357 Mag.
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Old 04-28-2011, 6:37 PM
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Unsafe? No. Detrimental to accuracy? YUP.

OP, please use the correct size bullet for your gun. They're spec'ed that way for a good reason.
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  #21  
Old 04-28-2011, 8:44 PM
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Quote:
Originally Posted by Cowboy T View Post
Laws of physics are laws of physics and thus apply regardless of the cartridge. That's what I was talking about.

The laws of physics do not govern firearm accuracy in terms of group size. For example, the Sig P210 which is the most accurate mass produced 9mm pistol shot 2" 50 yard groups with .355" bullets out of a .357" barrel.
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Old 04-28-2011, 9:09 PM
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Extreme plated bullets now make a .357 dia projo in 147gr RN. perfect for 38/357.....just fyi....

R
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  #23  
Old 04-28-2011, 9:21 PM
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I would not hesitate to cast a bunch of 9mm bullets and run them through a .357 or .3565 sizing/lube die and then load them in a .38 special or .357 cartridge and shoot them. As long as I didn't run them too hot, I'm sure they would work fine for plinking.
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Old 04-28-2011, 9:26 PM
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I am assuming this question is purely theoretical. Please only use ammo that was specifically designed for your firearm. Anything else is just a bad plan.
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Old 04-28-2011, 9:29 PM
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Because?
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Old 04-28-2011, 9:30 PM
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Quote:
Originally Posted by DVSmith View Post
I am assuming this question is purely theoretical. Please only use ammo that was specifically designed for your firearm. Anything else is just a bad plan.
You don't reload, do you? There's nothing unsafe about manufacturing .357 ammo designed specifically for a .357 and loaded with 9mm bullets. It's quite possible that accuracy and/or precision could suffer from the slightly undersized bullets though.
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Old 04-29-2011, 2:43 PM
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It depends on the bore dimensions of your gun. My customer SW 686 has a Kreiger. 355" barrel. It shoots 9mm bullets just fine. I think Colt Pythan has bore size tighter than .355" so it will shoot 9mm bullets just fine. If the bore diameter fits its up to the quality of the bullet.
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Old 04-29-2011, 4:13 PM
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Ok, Loaded up a TEST batch of 20 rounds each. Each round is cased in a .357 case with 5.5 gr of powder (light load). heres what i got

1. 9mm FMJ
2. Cast SWC .357
3. copper plated .357

Ill take pictures at the range of my groups and report back. Im assuming using 9mm FMJ wouldnt be too different from using cast lead in .357 since the jacket ads a little thickness. Ill shoot four 5 shot groupings of each
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Old 04-29-2011, 6:00 PM
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It will work fine in the barrel at least. Ruger Blackhawk convertable comes with an additional 9mm cylinder if you want to shoot those out of your 357.
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Old 04-29-2011, 6:20 PM
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Quote:
Originally Posted by CSACANNONEER View Post
You don't reload, do you? There's nothing unsafe about manufacturing .357 ammo designed specifically for a .357 and loaded with 9mm bullets. It's quite possible that accuracy and/or precision could suffer from the slightly undersized bullets though.
LOL, lost track of the forum I was in! I do reload, but wasn't focused on this being a reloading question. I will have to pay closer attention.

I will admit I have never tried loading undersized bullets (or over sized for that matter). Wouldn't the difference in size .002 likely be of little practical effect given that the base is likely to expand slightly under pressure anyway?
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