Necked Appearance of Fired 9mm Brass

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KB Hill

KB Hill

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Picked up some brass on-line (LE range brass). A handful of cases (several different headstamps) have almost a necked appearance. Kind of like they were fireformed in a stepped chamber? They re-size ok. Was just wondering if anyone had seen something like this before.
IMG_2800.JPG
 
That's interesting. I'm curious what the measurements are...
 
My Walther PPQ has a stepped chamber. I get a similar step in the brass.
It resizes and reloads just fine.

I can easily sort brass from my PPQ and my friend's Ruger SR9. The Ruger has a tapered chamber.

The step can an indicator to see if the powder charge is too weak. If the step isn't defined, I'll see carbon down the outside of the case. If the step is well formed, the outside of the case is clean.
 
Mn Fats said:
That's interesting. I'm curious what the measurements are...
Click to expand...
I've already sized all of the "stepped" cases. The did size a little harder than cases I fire from my 9's, but then I don't load anything too hot and the chambers are not excessive.
 
LiveLife said:
They could have been fired in firearms like MP5 with fluted chamber designed to improve spent case extraction.
Click to expand...

Doubtful. MP5 and the few other firearms with fluted chambers put parallel lines in brass going from the case mouth almost to the extractor groove.

KB Hill said:
Picked up some brass on-line (LE range brass).
Click to expand...

Were these law enforcement pickups? If you know what firearms they were using that could help narrow down how the brass acts inside the chamber.
 
WeekendReloader said:
My Walther PPQ has a stepped chamber. I get a similar step in the brass.
It resizes and reloads just fine.

I can easily sort brass from my PPQ and my friend's Ruger SR9. The Ruger has a tapered chamber.

The step can an indicator to see if the powder charge is too weak. If the step isn't defined, I'll see carbon down the outside of the case. If the step is well formed, the outside of the case is clean.
Click to expand...
Thanks. Searched "stepped chamber" instead of whatever it was that didn't provide an answer. Looks like it dates back to the early 1900's and is still used by Walther and possibly H&K. You learn something new everyday.
 
Those look like they might have been shot in an HK pistol. They reload just fine.

Edit: Oops, I type too slow.
 
herrwalther said:
Doubtful. MP5 and the few other firearms with fluted chambers put parallel lines in brass going from the case mouth almost to the extractor groove.



Were these law enforcement pickups? If you know what firearms they were using that could help narrow down how the brass acts inside the chamber.
Click to expand...
I ordered from Precision Brass. Really have no idea on any details other than advertised as once-fired LE range pick-ups. I did however order them unprocessed and with the exception of a few RP headstamps, they do appear to be once fired. Ordered 1K - 400+ SPEER, 275 FC, WIN, WMA, BLAZER, and a smattering of others.
 
My Q5 does that to the brass also. When I first got it I thought that has to be hard on the brass. But it doesn't seem to be.
I also noticed as @WeekendReloader said, the brass is cleaner and my Q5 barely needs cleaned when I get home from the range.
I clean the barrel and that's about all that's needs attention.
My SR-9 will be filthy inside and I will have to do a complete scrub out after shooting it.
 
WeekendReloader said:
My Walther PPQ has a stepped chamber. I get a similar step in the brass.
It resizes and reloads just fine.

I can easily sort brass from my PPQ and my friend's Ruger SR9. The Ruger has a tapered chamber.

The step can an indicator to see if the powder charge is too weak. If the step isn't defined, I'll see carbon down the outside of the case. If the step is well formed, the outside of the case is clean.
Click to expand...

Yup, my Walther's and HKs have stepped chambers as per the original 9mm chamber design. It's no problem and actually helpful if sorting brass with friends. That is IF you have any that don't shoot Walther's or HKs.
 
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