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#200026 - 06/08/19 03:32 PM 357 Brass Issue ...
PsTaN
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Registered: 07/18/15
Posts: 538
Loc: Alabama

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Below is a once fired piece of Starline .357 brass. I've resized, belled, and primed. I noticed what looks to be a bulge in every case. Running unfired brass through my dies does not repeat the issue, so I do not think I'm crushing the brass from incorrect set-up. Any ideas of what this might be? I have no memory whatsoever of signs of too much pressure or sticky cases when these were fired.

-10" MGM Encore barrel
-158 XTP
-14.5 of 2400

Any ideas would be appreciated!

P


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PsTaN

-Smith & Wesson Model 69
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"Hold your horses, the elephants are coming, and out stamped Alabama"

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#200027 - 06/08/19 04:08 PM Re: 357 Brass Issue ... [Re: PsTaN]
PsTaN
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Registered: 07/18/15
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Loc: Alabama

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After another quick inspection under a jewelers loop, this looks to be the deepest point at which the carbide ring of the die gets to. Also, the resized case will plunk in the barrel. Maybe I?m overthinking this, but I?m rather fond of my eyes and hands. LOL

P
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PsTaN

-Smith & Wesson Model 69
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"Hold your horses, the elephants are coming, and out stamped Alabama"

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#200029 - 06/08/19 04:59 PM Re: 357 Brass Issue ... [Re: PsTaN]
karl
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Registered: 01/12/15
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Is it really a bulge? Can you measure it with a micrometer or calipers?

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#200030 - 06/08/19 05:13 PM Re: 357 Brass Issue ... [Re: karl]
PsTaN
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Registered: 07/18/15
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Loc: Alabama

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.378

Rest of case measures .374.

It?s an Encore ... there?s total support for the case, so I probably shouldn?t have termed this a bulge like a Glock. I?ve loaded tons of .44 and 10mm and have never seen this.


Edited by PsTaN (06/08/19 05:23 PM)
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PsTaN

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#200031 - 06/08/19 07:03 PM Re: 357 Brass Issue ... [Re: PsTaN]
KYODE
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Registered: 01/18/04
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How about trying just sizing the case down to roughly where base of bullet is when seated????
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#200032 - 06/08/19 08:03 PM Re: 357 Brass Issue ... [Re: KYODE]
PsTaN
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Registered: 07/18/15
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Loc: Alabama

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Here's what I think is going on: Lyman says the outer case should be .379. My chamber measures at .378. Fired brass is expanding to the chamber at .378. My die is sizing to .374, but the sizing die only reaches the point where the "bulge" is. Therefore, it really isnt a bulge, but the true chamber size.

KYODE, I'm thinking you are right.

P
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PsTaN

-Smith & Wesson Model 69
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"Hold your horses, the elephants are coming, and out stamped Alabama"

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#200033 - 06/08/19 11:38 PM Re: 357 Brass Issue ... [Re: PsTaN]
KYODE
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Registered: 01/18/04
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Let us know how she looks 😉
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#200035 - 06/09/19 01:08 AM Re: 357 Brass Issue ... [Re: KYODE]
Bob Roach
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Registered: 03/02/10
Posts: 934
Loc: Missouri Ozarks

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I believe you have this figured out now.
I do not remember having a 357 come apart at the base so far anyway.
I have loaded many thousands of rounds of 38 Special at what is now considered to be Plus P. My case failures are always splits length wise in the cases after being reloaded forever.

Something you might consider doing is loading say Five new cases, and keeping them separate, and keep a card in the bag with them to track how many times you load them until they fail.
If you could shoot at your house this could really be speeded up.
You can still do this on Range visits, it will just take a little longer to get results. I believe you will be surprised how many loadings you will get.

Bob R
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#200037 - 06/09/19 03:19 AM Re: 357 Brass Issue ... [Re: Bob Roach]
Walkingthemup
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Registered: 10/01/05
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The sizer die sizes the case to under chamber size. The case is then expanded by the expander so as to ensure good tension with the projectile. The case head area is solid so the dies only goes down so far. The sharp transition between sized body and unsized head creates a 'step'. The problem is that the step can become work hardened and fail eventually. (many years ago I had a .45 ACP fail for that reason). Like Kyode suggested, I now only size to a point a somewhere below the base of the bullet. This allows for a more gentle transition.

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#200041 - 06/10/19 06:32 AM Re: 357 Brass Issue ... [Re: Walkingthemup]
dhom
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Registered: 03/24/13
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The only time I have seen a problem with the resizing die, the decapping pin was down way to low and stopping the case from fully entering the resizer. As long as the die meets the shell holder you are OK.

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