Mark K
Active Member
Living in Colorado Springs now, wife and I did some shooting (mostly with reloads) a couple days ago up in the mountains. :-)
I'm now processing the brass, as much of it as I could find in the pine needles. Out of about 100 9mm Luger shell casings that I fired, I noticed one that wasn't like the others (see attached).
It has a "shelf" all the way around the inside wall, about 2/3 of the way down toward the case head. All the other cases I ever remember seeing have been straight-walled all the way down.
Its headstamp, besides 9mm Luger, shows *IMT*. So apparently Turkish Anatolia Cartridge Industry Co. LTD.
Seems like that interior narrowing would significantly reduce the internal volume of the case. Would that cause a pressure issue?
Or does the manufacturer compensate for that...? In other words, how "standard" are the internal-volume standards for 9mm Luger worldwide?
This was obviously one of my range-pickup reloads. No overpressure signs on the case -- the primer's already gone.
Since this is the only case like this out of ~100, I'd be glad to trash it. I just need to know if I have to pay much closer attention to headstamps in the future...
I'm now processing the brass, as much of it as I could find in the pine needles. Out of about 100 9mm Luger shell casings that I fired, I noticed one that wasn't like the others (see attached).
It has a "shelf" all the way around the inside wall, about 2/3 of the way down toward the case head. All the other cases I ever remember seeing have been straight-walled all the way down.
Its headstamp, besides 9mm Luger, shows *IMT*. So apparently Turkish Anatolia Cartridge Industry Co. LTD.
Seems like that interior narrowing would significantly reduce the internal volume of the case. Would that cause a pressure issue?
Or does the manufacturer compensate for that...? In other words, how "standard" are the internal-volume standards for 9mm Luger worldwide?
This was obviously one of my range-pickup reloads. No overpressure signs on the case -- the primer's already gone.
Since this is the only case like this out of ~100, I'd be glad to trash it. I just need to know if I have to pay much closer attention to headstamps in the future...