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Glock primer buldge question

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Nate1778

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Well I reloaded some 9mm 5.2g of unique behind a (temporary) 100 grain berry .380 bullet. Went and shot it out of my new to me G19. Rounds went bag and didn't seam out of the norm, definitely had some bang to them, but upon inspection of the brass I started to notice an imprint around the firing pin dent. I noticed there is a large gap around the firing pin, not just a hole and didn't know if this was normal for a Glock. The gunsmith at the range said he had never scene it before, so I quite shooting till I can get some better load data, and bullets. What are your guys thoughts, over pressure, normal Glock behavior? The primer is a Remington SPP. All 10 of them looked this way, some worse than others.



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Well that's good to know, I thought I was pushing it to hard. A second question would be with the case in the background. Note the dark burn on the side of the case. I also noticed that 3-4 of the 18 rounds I fired I got a bright flash from the gun. Can someone tell me if these two items are related and what is causing them.
 
Any idea of how fast those rounds were going? Berry's don't like pushing past 1200 fps- so you could have been having some weird blow by due to jacket seperation if you were going much faster. If the load is too light, you will also get a sooty case, due to blow back. The case needs to expand tight to the chamber to make sure that all of the gas goes out the end of the barrel. That looks like a REALLY light load, so I am betting that the case wasn't expanding enough to give you a complete gas seal.
 
The gunsmith at the range said he had never scene it before
Click to expand...

So, how long has he been gunsmithing, roughly? ;)

That's a normal firing pin impression from a glock and indictive that brass has been fired in a glock pistol.

Like others have mentioned, sooted cases is usually caused by light loadings. It maybe that a light charge is also the cause of an abnormal muzzle flash as pressure is not optimum to complete burning within the barrel.
 
So, how long has he been gunsmithing, roughly?
Click to expand...




Sad part is it looked like a while. Guy was a spitting image of Willy Nelson, Nice guy but didn't seam to wrap his head around reloading, and both guys at the range stated they didn't pick brass up regularly to inspect it. Its why I love the range, all the free brass I can scrounge.

Matter of fact they are an authorized Glock dealer and I know they sell a lot to the police. He even took me back to his Gunsmith cave and gave me the Glock tour. Broke it down, showed me the ins and outs of cleaning and lubing a Glock. Then he had this cut away Glock that you could see what was happening on the inside and he demonstrated how it worked, pretty cool.

Offered to do a trigger job on it for $45 but I declined for now, although I did get to cycle his Glock .40 and the trigger pull was much lighter and crisper, so I may have him do that.

That said I seriously don't think he had ever looked at a fired brass cartridge before.........
 
5.2 grs of Unique behind a 115gr bullet is a relatively mild load that chrono's at around 1,140 fps from my Glock 19. With the lighter .380 bullet its even lighter. Light loads will often leave primers bulged looking like pressure signs even though they are definitely low prssure loads. This is due to the case not being held firmly against the breach allowing the primer to expand a bit.
 
It's a Glock thing. And especially with the light 9mm. The powder blow by it a sure sign of a light load not sealing. 40 S&W not so much, until you get into the higher pressures. If the primer was flat, even at the outside edge, with that kind of primer flow in the middle I would beginning to be concerned. But as you can see the outside edge of the primer is still round and the primer does not look like it is set back at all.
 
I shoot pretty light loads in 9mm and get exactly the same look on the primer, so as others have mentioned there is nothing to worry about. PLEASE don't pay for anyone to do a trigger job on a Glock for you. It is so easy that in my mind it doesn't fall under the "gunsmithing" category. For $20 in small parts that are easily installed you can get a very good trigger. Cleaning time aside, I did mine in about ten minutes with absolutely no prior experience with Glocks. For quite a bit more you could get a fantastic drop-in trigger from Vanek or Glockworx.
 
Not enough pressure to seal the case in the chamber.

Not enough pressure to flatten the primer back out against the breach face.

In short, not enough pressure.

rc
 
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