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Strange bulge....

This is a discussion on Strange bulge.... within the MP Ammunition forums, part of the Smith & Wesson MP Forum category; Well I was out at the range today and started off like usual with my SD ammo that was already in the mag. After putting ...


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Old February 5th, 2014, 01:41 PM   #1
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Strange bulge....

Well I was out at the range today and started off like usual with my SD ammo that was already in the mag. After putting it down range with my usual accuracy and no malfunction of any kind I was picking up my casings off the bench and noticed this





After that I went to my Win white box brass without the plating and no bulge. It doesn't go all the way around the case just a little in a third of the circumference. Anyone seen this before? The slide closes fully no open breach that I can tell. And like I said gun still working flawlessly with the best accuracy I can give it.

Should add as well it's a shield .40 the ammo with bulge was hornady critical defense.

Last edited by Rift; February 5th, 2014 at 01:44 PM.
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Old February 5th, 2014, 01:56 PM   #2
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It looks for all the world like a Glock bulge, but you shouldn't see that in a Smith.
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File Type: jpg glock-brass.jpg (11.6 KB, 20 views)
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Old February 5th, 2014, 03:16 PM   #3
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Quote:
Originally Posted by Rift View Post
Well I was out at the range today and started off like usual with my SD ammo that was already in the mag. After putting it down range with my usual accuracy and no malfunction of any kind I was picking up my casings off the bench and noticed this


After that I went to my Win white box brass without the plating and no bulge. It doesn't go all the way around the case just a little in a third of the circumference. Anyone seen this before? The slide closes fully no open breach that I can tell. And like I said gun still working flawlessly with the best accuracy I can give it.

Should add as well it's a shield .40 the ammo with bulge was hornady critical defense.

It is feed ramp bulge. It is caused by a lack of case support from the feed ramp cutout in the barrel. The higher pressure critical defense ammo will do that. It is normal. Don't reload it. Just toss it.

Go to https://en.wikipedia.org/wiki/.40_S%26W and look at the section labeled "Case failure reports."





.

Last edited by 24th id; February 5th, 2014 at 04:28 PM.
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Old February 5th, 2014, 04:45 PM   #4
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Originally Posted by 24th id View Post
It is feed ramp bulge. It is caused by a lack of case support from the feed ramp cutout in the barrel. The higher pressure critical defense ammo will do that. It is normal. Don't reload it. Just toss it.

Go to https://en.wikipedia.org/wiki/.40_S%26W and look at the section labeled "Case failure reports."





.
I don't do any reloading or shot reloads so I guess I'll be alight then? Just seemed odd that it is only the nickel plated ammo doing this. Guess I'll just stick to big and slow than light and fast the heavier grained ammo seems to not be as snappy anyway while the CorBon felt like a wrist breaker.
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Old February 5th, 2014, 04:55 PM   #5
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Quote:
Originally Posted by 24th id View Post
It is feed ramp bulge. It is caused by a lack of case support from the feed ramp cutout in the barrel. The higher pressure critical defense ammo will do that. It is normal. Don't reload it. Just toss it.

Go to https://en.wikipedia.org/wiki/.40_S%26W and look at the section labeled "Case failure reports.".
The M&P has a fully supported case/chamber.

Last edited by jasonuscg; February 5th, 2014 at 05:07 PM.
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Old February 5th, 2014, 08:53 PM   #6
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Originally Posted by jasonuscg View Post
The M&P has a fully supported case/chamber.

Not my M&P 45, but it doesn't matter with the 45 because it is only 21,000 psi max, and not 35,000 psi max pressure. I don't have a 40 M&P but I thought they would be the same as the Glocks and XDs.


Here is a thread I found that shows some unsupported cases. It is for 9mm, and not 40.

http://www.hkpro.com/forum/hk-handgu...super-usp.html



.

Last edited by 24th id; February 5th, 2014 at 09:20 PM.
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Old February 6th, 2014, 08:36 AM   #7
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Shields are not fully supported, either.
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Old February 6th, 2014, 09:23 PM   #8
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Shields are not fully supported, either.
I thought I saw the word SHIELD in the original post.

Here is a picture I swiped from the smith-wessonforum.


Last edited by 24th id; February 6th, 2014 at 09:32 PM.
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Old February 7th, 2014, 09:53 AM   #9
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Clears up that thanks forum.
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Old February 10th, 2015, 07:26 AM   #10
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Originally Posted by 24th id View Post
I thought I saw the word SHIELD in the original post.

Here is a picture I swiped from the smith-wessonforum.

Groo here
Good Photo.
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Old February 10th, 2015, 07:42 AM   #11
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Just an FYI, XDs have fully supported chambers. Glocks, the one's I've seen, don't.
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