Author Topic: JAG head stamp case failures...  (Read 176 times)

Forrest

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JAG head stamp case failures...
« on: January 13, 2018, 05:10:00 PM »
Shot some Jag headstamp 180 FMJ today in my 29SF and experienced several split cases on what I believe to be new ammunition. That really upset me as I was hoping to use the once fired brass. I don't think I will be reloading this batch of brass. There's no use in tempting fate after a few split cases as new. I don't trust it now.
My hot reloads went without issue save two light strikes. Apparently the Glock doesn't like CCI magnum primers. I could put the heavier striker springs in, but they will not be getting a steady diet of this. The second strike did not work, but the Delta was happy to come out and eat the leftovers. I was struck by the marked increase in energy the loads were exhibiting on target with the Delta's slightly longer barrel. Full spins of the plate instead of a heavy rock. The Glock is not as pleasant to shoot as the DE. There is a whippy shock to the recoil impulse which I find happily absent in the 1911.
« Last Edit: January 15, 2018, 03:28:28 PM by Forrest »

Intercooler

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Re: JAG head stamp case failures...
« Reply #1 on: January 14, 2018, 01:27:24 AM »
These were new factory rounds? What MFG and do you have any pictures/measurements of the bad ones?

Forrest

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Re: JAG head stamp case failures...
« Reply #2 on: January 14, 2018, 03:32:03 AM »
I have the old cases and will mic them. The box...not so much. They were factory and new shells maybe a few years old. I'm a reloader of 10mm, not a purchaser. I'm going to look and see if I have another box laying around.

Intercooler

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Re: JAG head stamp case failures...
« Reply #3 on: January 14, 2018, 05:58:36 AM »
Who was the MFG?

sqlbullet

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Re: JAG head stamp case failures...
« Reply #4 on: January 15, 2018, 08:47:27 AM »
Jag is generally considered to be high quality brass.  I am curious about the mfg as well.

Forrest

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Re: JAG head stamp case failures...
« Reply #5 on: January 15, 2018, 02:14:38 PM »
Sorry I seem to be at a loss for the box. It may have gotten beaten up and I trashed it. The rounds were held in black plastic caliber specific tray. Found a picture on the web... Precision One. That's the stuff. Some of my cases are tarnished a bit but dang.
I measured two cases that had split and found .432-.435 at the area of splitting. Some of the cases have fingerprints and a decent amount of tarnish. This was range ammo from some indoor range.

ETA
I just fired some 17 rounds of that ammo in night practice with a lone Wolf extended barrel and found no splits. Go figure?
« Last Edit: January 15, 2018, 03:24:42 PM by Forrest »

my_old_glock

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Re: JAG head stamp case failures...
« Reply #6 on: Today at 09:21:09 AM »
Sorry I seem to be at a loss for the box. It may have gotten beaten up and I trashed it. The rounds were held in black plastic caliber specific tray. Found a picture on the web... Precision One. That's the stuff. Some of my cases are tarnished a bit but dang.
I measured two cases that had split and found .432-.435 at the area of splitting. Some of the cases have fingerprints and a decent amount of tarnish. This was range ammo from some indoor range.

ETA
I just fired some 17 rounds of that ammo in night practice with a lone Wolf extended barrel and found no splits. Go figure?


Supposedly Glock (17) chambers are larger than SAAMI spec. They did that so dirty and corroded ammo (during a war) can still function in the gun. I do not know if they do that with all their barrels and calibers. Larger chambers can make brittle/hard brass cases crack.

Some of the powders coming from Europe are unstable, start to degrade, and release gasses which weaken the brass. I have had some 5744 and 2495 powder do that. Those are both from Accurate and they are both rifle powder, not pistol powder, but I used the 5744 in my 454 Cassull revolver loads. The 2495 powder was made in Belgium and the 5744 was made in either Chekoslovakia or Croatia (something that starts with a "C").



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