Loading 9mm too hot

[RR.44]

I was collecting brass at the monthly CG shoot at Insight last night, well I've come across several 9mm brass fired not only from a Glock but from a standard round type firing pin weapon that have the primers with holes blown through them, I can't say who's reloads these were but they are definitely loaded very hot.
So my question is; how many of you actually inspect your brass after you have fired your reloads and have you made necessary adjustments if needed?

[RR.44]

I've also come across several that have mushroomed primers.

[DSMeyer]

I would probably say it's insights house ammo. Especially if you've come across different firing pin marks

[pacrat]

I've also come across several that have mushroomed primers.

Mushroomed or protruding primers are typically an indicator of low pressure.

Can you post pics of the punctured primers? Punctured primers are not "always" an over pressure indicator. There are many things that can cause that to happen.

I "always" inspect my cases. Not every one as soon as fired. But definitely before reloading the case again.

JM2c

[JMP]

It's almost hard to over charge a 9mm. It's really not a case you hear of blowing up frequently due to the small volume even with the fastest powders. It's possible, but you really need to be doing something fundamentally wrong as you can safely meter 9mm by eye-balling it. I'd suggest putting up some pictures of the cartridge; otherwise, most will assume that it's probably a misinterpretation of over-pressure.

[area51]

Like others have said, post some pictures

[rsrocket1]

I was fortunate enough to shoot next to a couple of guys who did not want their brass 9/40/45 (woot!). My only regret was that I didn't stay longer to pick up several hundred more cases. While sorting it out this morning the 9's did look odd, but after closer inspection, the primers were actually mushroomed and not flattened/pierced. Probably too low pressure from RP skimping on the charge.
My handloads with 5g Unique on top, factory loads on the bottom (I think they were shooting a Sig):

[J-cat]

That's actually normal for RP 5 1/2 primers fired in a Beretta 92.

[kmca]

Could be a round loaded to almost magnum velocities. That's what's required for a race gun.

[JMP]

As a question, does anyone know anybody that has blow up a modern 9mm? It's much easier to do in a 45 ACP where you can get much higher volumes. I'd not be concerned with any of the 3 cases provided in the picture. In bolt action rifles that operate at extreme pressures, many people continue to load the cartridge as high as they can until they start piercing primers. This commonly happens with small primers, but many use that as the pressure test as the point of piercing primers is commonly the first pressure sign you will see that also requires you to remove the metal from your firing pin hole. It is extremely common on 6BR and 6 Dashers, which is why small firing pin holes have become the norm. However, in a good gun, the pressures are usually fine up until the point the primers pierce. That is the other benefit of small primer cases--that you do not loose your primer pocket with hotter loads.

[RR.44]

I can't post pics from my cell phone, I was just surprised to see the primers with holes in them, whether they were over loaded or under loaded is a toss up I guess, I just think, although you could correct me if I'm wrong but, if there is a hole in your primers aren't those gasses effecting the breach of the gun being used?

[CSACANNONEER]

I've never heard of primers "mushrooming" before. Now that I see pictures of primers with cratering, I know it's the same thing. I just don't see why anyone would call it "mushrooming"? What am I missing?

[J-cat]

Mushrooming occurs when you have a case with a large radius leading into the primer pocket, a soft primer, and high pressure.

[Sheldon]

I've had a case blow out on my Beretta 92. Could have been too hot a load or a weak case. No real damage...the trigger transfer bar popped out a bit but slid right back into place. You can blow a case.

[orangeusa]

I don't know if you call it mushrooming, but I shot some 45C primered casings (no powder, no boolit) in a revolver and they were almost impossible to remove. (Yeah, I know the physics - I figured it out after I did it).

Overpressure is an abused primer - really flattened with headstamps bearly visible - right?

And I doubt you can blow up a 9mm. They shot Uzi - super hot rounds in 92's during selloff.

I dunno.

.