9mm case explosion with Gen 3 G34

[platoonDaddy]

This AM shooting my WIN brass reloads; 5.5 Grs of WSF, COL 1.169, CCI #500, had an explosion. Note attached pictures. Of course it resulted in a few minor burns to both hands. I don’t keep count of the # of times the brass was reloaded. During reloading, every so many rounds I will check a few with a Wilson Pistol Gage.

Any idea on what might have caused the issue..

 

[Squaregrouper]

This AM shooting my WIN brass reloads; 5.5 Grs of WSF, COL 1.169, CCI #500, had an explosion. Note attached pictures. Of course it resulted in a few minor burns to both hands. I don’t keep count of the # of times the brass was reloaded. During reloading, every so many rounds I will check a few with a Wilson Pistol Gage.

Any idea on what might have caused the issue..

Unsupported Glock chamber perhaps?

 

[blazing lead]

Dam glad your ok , possibly bullet setback during chambering of round . Or a little heavier than the 5.5 dropped, I'm not sure if a double charge of that powder would fit in a 9mm case as I have never used it.

I know them little casing aren't to forgiving I had one pop like that a few years ago when I first started loading cast in 9 mm because my crimp wasn't enough to prevent setback

 

[brianns]

Check your crimp. The projectile could slip further into the case after multiple chamberings if that might have occurred, coupled with the unsupported chamber as Squaregrouper mentioned.

 

[pre64hunter]

Corroded brass, maybe on the inside. I've had old factory ammo do that in rifles a few times in the same area of the case. A tiny spot of green verdigris would rupture into a hole.

 

[Bountied]

Out of battery detonation. I had this happen to me with a factory 9mm round. The chamber was a little sticky and the bolt wasn't fully closed on a PCC. It blew the powder out of the hole it made that looked just like that. The bullet didn't leave the barrel but was easily pushed out. I polished and cleaned the feed ramp and it's been fine. Startled me for sure.

What were you shooting? More info is needed.

Here is mine.

 

[John from MD]

OOB detonation as referenced above. It can happen for a number of reasons including a dirty chamber and a disconnector that is not fitted correctly.

 

[usa259]

about 15 years ago, two separate squibs, threw the rest out...

 

[platoonDaddy]

Out of battery detonation. I had this happen to me with a factory 9mm round. The chamber was a little sticky and the bolt wasn't fully closed on a PCC. It blew the powder out of the hole it made that looked just like that. The bullet didn't leave the barrel but was easily pushed out. I polished and cleaned the feed ramp and it's been fine. Startled me for sure.

What were you shooting? More info is needed.

Here is mine.
View attachment 465222

Gen 3 G34

For sure startled. Checked frame, everything looks okay. Bullet did leave barrel…

Shot two more mags…

 

[wilcam47]

Could be just bad casing...defect

 

[Squaregrouper]

What was the bullet? 5.5gr WSF is mighty hot for anything 124gr and above. OAL of 1.169" leads me to believe it was 115gr, but want to hear from the OP.

 

[Mark75H]

Curious to know what the primer strike looks like and how far OOB this gun has to be to lock the firing pin.

 

[Bountied]

Curious to know what the primer strike looks like and how far OOB this gun has to be to lock the firing pin.

With Glocks it's almost impossible to have OOB detonation. Once the slide moves about 3/32" it won't fire. May have been a high pressure situation with weak brass after the barrel unlocked?

 

[platoonDaddy]

What was the bullet? 5.5gr WSF is mighty hot for anything 124gr and above. OAL of 1.169" leads me to believe it was 115gr, but want to hear from the OP.

115gr, note following

 

[platoonDaddy]

Curious to know what the primer strike looks like and how far OOB this gun has to be to lock the firing pin.

 

[Bountied]

Kind of an odd strike on the primer but looks like a Glock strike.

 

[brianns]

Check your other reloaded cases for the 'smile'. A weakened case might fill into the unsupported chamber mouth more than a new factory case and show the shape of that area that is just above the feed ramp. I think I've heard it called a smile. (if this is what might be going on or related)

 

[303_enfield]

115gr, note following

Um, the G34 has a barrel longer the 4”. That load is hot.

Looks like the brass failed. Time to start marking the brass and toss after three warm loads.

Just looked up the barrel length, 5.31”
Size matters!

 

[John from MD]

Gen 3 G34

For sure startled. Checked frame, everything looks okay. Bullet did leave barrel…

Shot two more mags…

Get a KKM barrel. It won't scare you and it will be more accurate.

 

[outrider58]

I got that beat!

Double Load(checked that box)?

Catastrophic failure: I was at the range this morning and this happened. I had experienced a squib round(no powder) where the primer pushed the 9mm bullet into the rifling. Hearing just a puff sound, I knew to stop, wait, drop the mag and eject the expected empty case. I made the gun safe and...

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