Does anyone know what causes this


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stang46gt
October 26, 2009, 04:49 PM
This is .45ACP range brass. I uually do a visual check of the primers before I de-prime and I saw these two.

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rcmodel
October 26, 2009, 04:56 PM
Primer is extruding back into the FP hole in the slide for whatever reason, then shearing off when the barrel drops to unlock. May be caused by soft primers, a gun timing problem, or an undersize firing pin.

The firing pin channel will rather quickly become packed with brass shavings and cause misfires eventually.

rc

stang46gt
October 26, 2009, 05:03 PM
RC, thanks for the prompt reply. I am very new to reloading and very curious. I am resizing a batch of about 1500 cases and those are the only two I've found and I'm about 80% finished.

Thanks again.

Walkalong
October 26, 2009, 07:09 PM
Yep. Like these two. :o

http://www.thehighroad.org/attachment.php?attachmentid=107829&d=1256393654

Something to be avoided, for all the reasons rcmodel listed, plus it can be a sign of overpressure.

627PCFan
October 27, 2009, 10:01 AM
Notice the headstamp- Corbon- probably high pressure loads-

1911Tuner
October 27, 2009, 10:19 AM
Primer flow. Excessive headspace problem.

Walkalong
October 27, 2009, 10:45 AM
Mine were probably overloads. :eek:

Since I sized them on my Projector, way back when, I may very well have created artificial headspace. I just recently set up my dies on the LNL and was much more careful setting up the sizer.

TEDDY
October 27, 2009, 09:17 PM
those are 400 cor bon.they must have been loaded hot to cause the primer to be sheared like that.I dont like the idea of a bomb in my hand.but alot seem to not care.:rolleyes::uhoh:

TEDDY
October 27, 2009, 09:38 PM
how do you change headspace on a straight pistol case?

Walkalong
October 27, 2009, 09:41 PM
.400 Corbon is a necked down .45 case. :)

ants
October 27, 2009, 10:13 PM
Starting at Post 4 or 5, we have two different conversations going here. No problem, as long as we keep ourselves straight.


The OP says that this is range brass he picked up. He is not overloading his ammunition. The previous shooter did.


Stang46gt - Those two cases may be OK to load and shoot, but pay attention when you seat the primer. If the new primer slides right into the pocket with no resistance, the case is unsafe. The case head (including the primer pocket) expands slightly with each normal firing. But it expands a lot when overloaded, so loose primer is the bad sign to look for.

whatnickname
October 27, 2009, 10:30 PM
PMC stands for: "Poorly Made Ammunition"

R.W.Dale
October 27, 2009, 10:42 PM
Wouldn't that be

Poorly
Made
Cartridges

?????

ArchAngelCD
October 28, 2009, 03:24 AM
Actually, PMC ammo is quite good. It's made on top grade machinery and I've never had a problem with any PMC ammo I've shot. (both handgun and rifle ammo)

ants
October 28, 2009, 04:26 AM
...the old Abu Dhabi contract 5.56 Nato that PMC so overcrimped you can't even decap the old primer, and if you do get it out you'll never get a new primer into the pocket. Other than that, they PMC makes good stuff.

HK G3
October 28, 2009, 04:37 AM
I've been reloading PMC range pickups for my .45 with great results.

I haven't shot their ammunition, but I can't complain about their casings - I've had some great groupings using reloads in PMC brass.

Walkalong
October 28, 2009, 09:21 AM
Starting at Post 4 or 5, we have two different conversations going here. No problem, as long as we keep ourselves straight.Yep. I confused things. Should have stayed out of it. ;)

4sooth
October 28, 2009, 08:13 PM
This can also be caused by a very weak firing pin spring.

Seedtick
October 29, 2009, 01:57 AM
Walkalong quote: Yep. I confused things. Should have stayed out of it.

WRONG!

You, sir, should never stay out of a discussion in this forum.

'Nuff said.

ST

ArchAngelCD
October 29, 2009, 04:10 AM
Walkalong quote: Yep. I confused things. Should have stayed out of it.
WRONG!

You, sir, should never stay out of a discussion in this forum.

'Nuff said.

ST
I totally agree... :)

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