Whats causing this on my 9mm brass after sizing

[psyshack]

IMHO I would look at the die to see if it's fubar. If the die is good. I would check shell holder to die alinement's. And adjust as needed. <<<< I say this because I had to adjust my new LCT. I was out just a tad. That tad did the same thing to a .357 piece of brass in the sizing die.

 

[amlevin]

Any 9mm cases that look like this go into the "brass recycle bucket". I get enough range pickup brass that I don't need to pull my hair out over issues like this. If only some cases are coming out like this don't sweat it. If all are, look at your setup.

 

[mdi]

Not a 9mm reloader, but do other semi-auto rounds. To my uneducated eye it looks like the case is being started in the die at an angle, possible with the tapered 9mm?

 

[Bello]

I do!

 

[howlnmad]

It does seem odd that it's not happening to all the cases. It almost seems like the die is off center or the brass is entering at an angle, maybe caused by the primer? No wait, that can't be cause there is a hole for the primer to be pushed through. Isn't there?

 

[LiveLife]

I did notice this on some of the brass and this brass is leaving the worst ridge
The old primer is not letting the casing set flat in the shell plate

Rudy, if the spent primer with a ridge ring is not letting the case sit flat in the shell plate, perhaps you can do a test?

Take out the depriming pin and punch out the primers with a hammer. Then, when you size the cases without the primers and the cases come out normal, you would confirm it was the spent primers with the ridge ring. Of course, if the problem persists, it could be that not all the cases are "bulging" the same.

Do the problem cases have the same head stamp? I have run into cases with softer brass that gave me problem with seating bullets.

 

[RUDY850]

I tried all suggestions and checked every thing over.

Its still doing it now and then.

I'm going to give up before I pull the last couple of hairs I have left out of my head.

Thanks.

 

[Steve Marshall]

These bulges are caused by a combination of unsupported head on firing and sizing dies not ironing them out. Unless they don't chamber, there is no big issue. If they don't chamber normally it's a possibility that the sizing die is suspect. But remember this, almost all factory ammunition is smaller than maximum dimensions else the rounds wouldn't chamber. And almost all dies will size brass to fit minimum chambers but no more than that. I once owned a Ruger P-85 that the fired brass looked pregnant, even after sizing. But the rounds would chamber in any other 9MM I tried them in.

 

[popper]

I've never seen this on 9mm. Your pic of problem case appears to have damage to the lip in the same dented area. Also case appears longer in that area, but it may be distortion from camera.

 

[BADUNAME37]

See if a Lee Factory Crimp Die irons that out.

 

[GLOOB]

More sizing will make it worse. I wonder if you screw your sizing die out a tad and this problem goes away.

 

[Walkalong]

And if it doesn't (which it probably won't), or cases don't fit the chamber, then replace the die. The entrance is to sharp at one point.

 

[918v]

No, that is not normal. This looks like brass that has expanded at the casehead beyond anything reasonable. Please measure 10 cases for case body expansion, mark them, resize them, and tell us what the problem ones measured before sizing. Most standard pressure 9mm's expand to .391" in most chambers. +P+ expand to .394"+. The case you pictured looks like it went even beyond that. Do not reload load them.

 

[TheCol.U.S.M.C.]

My buddy has a ton of 10mm that looks just like that. He shoots a S&W with full moon clips and a 1911. He tried the lee bluge buster he said it helped a little but it was still there. My buddys problem was it wouldn't chamber in his S&W, but worked fine in the 1911. he likes the S&W better I'll see him today and find out more

 

[918v]

We're talking about the 9mm. A reloadable 9mm case looks like the one in the first picture. The second picture looks like a 9mm Major.

 

[jinxer3006]

The old primer is not letting the casing set flat in the shell plate

Ummmmm.....I'm not familiar with your press, but doesn't you sizing/depriming station have a hole for the primer to drop through? If so, how would the primer ridge cause a problem?

 

[noylj]

1) don't screw the sizing die so far down.
2) deprime your cases before cleaning them. Let the depriming pin in the sizing die knock out the occasional speck of media in the flash hole.
3) Don't pick up stray brass at the range without carefully inspecting it when you get home. Too many are hot-rodding the 9mm to make it a .38 super
4) If my primer looked like that, I would either back off on the charge weight or take the gun to a good 'smith.