My first "blown out" primer

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Palladan44

Palladan44

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Was shooting my 10mm at the range yesterday, and fired 5 rounds of my go-to loads, they are medium-warm loads. Went to pick up the five pieces of brass, and one of the primers was completely missing. Is this just a rare freak, or is it almost always indicative of excessive pressure?

Glock 40 MOS- Once fired SIG brass- CCI-LPP
9.2gr Longshot
180gr HAP- JHP to 1.258" OAL
They average 1,340 fps with ES of around 30

I've about 200 more of these loaded up, and have fired about 100 of these in the past, they are the most accurate and consistent load in this gun that I consider to be full powered loads.
What do y'all think? This is an occurrence that I've never experienced before which is a pretty big Red flag to me
 
If the primer is completely gone you had a loose primer pocket and it just fell out during extraction or it wasn't seated deep enough and it fell out during extraction, either is no big deal. When the primer is still in the case and it is pierced with a hole in it is when you had an overpressure problem. That is the definition of a blown out primer. Your situation is of no worry.
 
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I agree with bluetopper. It was just a loose primer pocket. The fact that you shot that many of the same load before this happened kind of proves this.
 
One out of how many? Headstamp? Probably just a loose pocket as blue mentioned (or over reamed, crooked swaged pocket).
 
I prime off press and can feel the tension the primer is seating with. In some cases the primer brand will be a looser fit. Recent example for me is Remington brass finish SPP were a looser fit in some once fired .357 nickel R-P cases I was loading, to the point I decided to save them for another time. I used nickel plated CCI SPP instead and the fit felt better regarding seating tension.
 
Palladan44 said:
What do y'all think? This is an occurrence that I've never experienced before which is a pretty big Red flag to me
Click to expand...
I think Hodgdon is only saying 7.0gr Min to 8.2 gr of Longshot @ 1249 fps for maximum load and your using 9.2gr and considering them "medium warm loads".
Who's manual did you get that load of yours from?

I would back your load down to a reasonable level, like 8.2gr which is Hodgdon's max for the 180gr bullet. That may be the problem.
I would err on the side of caution and stop at Hodgdon's max published load.
Or am I looking at the wrong data?
 
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In doing some digging I see that the max used to be 9.5 and now Hodgdon now is saying 8.2 gr for Sie JHC 180 gr bullets.
That is a heck of a difference. Wonder what cause Hodgdon to do that.
Pallidan, How old is your powder? If it's new you may want to drop to 8.2 for max load.
 
tightgroup tiger said:
I think Hodgdon is only saying 7.0gr Min to 8.2 gr of Longshot @ 1249 fps for maximum load and your using 9.2gr and considering them "medium warm loads".
Who's manual did you get that load of yours from?

I would back your load down to a reasonable level, like 8.2gr which is Hodgdon's max for the 180gr bullet. That may be the problem.
I would err on the side of caution and stop at Hodgdon's max published load.
Or am I looking at the wrong data?
Click to expand...


Nope that's what Hodgdon says.

https://shop.hodgdon.com/reloading-data-center
 
I have data on a Hornady manual that lists 8.5 starting and 9.5 maximum.
The powder has been acquired within the last 24 months, so it is new.
 
Brass fired at maximum may have a short life. 5 or less firing.

All components used must be exactly the same as in the printed data. (Hornady)

20220313_143441.jpg

Generic load data is a bad idea. Pressure can not be the same for all 3 bullets.
 
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One of events get enough attention to increase my observations. If it never happens again keep on. If it happens again then start digging.
 
Palladan44 said:
Went to pick up the five pieces of brass, and one of the primers was completely missing. Is this just a rare freak, or is it almost always indicative of excessive pressure?
Click to expand...
So many words, so few pictures. . .

I'd look at the other primers to see if the load was warm. I have picked up a whole lot of pistol brass, including many with obscenely overpressure primer flow. . . and never seen a pistol primer fall out on its own. I bet it's something other than pressure.
 
Photo looks like normal Glock to me?? Dont own one. I Do look at range brass.

If only the 1 problem? Could the powder drop be bridging? Instead of the case being charged with 9.2 grs, , it only gets 8 grs. The other 1.2 grs drops with the next charge of 9.2 gr. This case now contains 10.4 grs. An over load. Something to watch for.

IMR 800X would do it, in some measures.
 
Unless it's been redesigned, Glock uses an unsupported chamber, so a too-high pressure round should show other signs, such as a swelled case at the head where the bottom of the chamber at the feed ramp didn't support it. Pierced primers or flattened primers are also more likely seen than one that came out, which couldn't happen anyway until the case was ejected.
 
I have an alpha wolf barrel with better chamber support.
What I like about them, they never get the dreaded bulge, and you don't have to roll size or push through resize the brass. No glock Smiles ever with these aftermarket barrels, I highly recommend them.
 
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Your recipe said “once fired.”

Could a case have gotten into the batch that had been fired several more times?

That was my initial thought before I read your recipe.
 
kalielkslayer said:
Your recipe said “once fired.”

Could a case have gotten into the batch that had been fired several more times?

That was my initial thought before I read your recipe.
Click to expand...
To be quite honest I cant say with 100% certainty. But it's highly unlikely.
I like to use Nickel Brass for the warmer loads, nickel shows signs of wear and one that has been loaded 3,4, or 5 times tends to show it in the finish....where yellow brass polishes up well and can't really tell. Nickel Brass that's downgraded to target loads tend to look a bit weathered.
 
If one purchases "once fired" brass, the only thing he'll know for sure is that it has been fired at least once, but maybe 8 times. I like "used" terminology much better...
 
mdi said:
If one purchases "once fired" brass, the only thing he'll know for sure is that it has been fired at least once, but maybe 8 times. I like "used" terminology much better...
Click to expand...
I agree with this. The dead giveaway is when you see R-P or F-C Brass with a gold colored(Usually WIN) primer, where every one ive ever seen is a silver in colored, in most pistol calibers anyway.
Also the reamed primer pockets you get every once in awhile you know someone has reloaded them at least once.
 
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