Mad Chemist
Member
So I was inspecting my carry ammo today after a range visit and to my surprise some of the rounds were visibly shorter than others. I pulled out the calipers and measured a COAL ranging from 1.082-1.115. The scary part was that I was able to shorten the COAL by squeezing a round between my fingers. I shrunk it down to 1.075.
I emptied all this stuff out of my mags and replaced it with my 124gr XTP handloads for now. At least I know they will pass the push test.
I sent the following to Corbon via their website just know. I'll post up their response when I receive it. I hope they are responsive.
Hi,
I carry Corbon DPX 95gr ammo in 9mm. I recently inspected my loaded magazines and found multiple rounds with significant bullet set-back. About half of the rounds measured between 1.10-1.14" for cartridge overall length. A few of my rounds measured less than 1.10, with the shortest measuring 1.082. I unloaded and set aside all of the rounds that measure less than 1.10".
I was able to seat a bullet deeper into the case simply by squeezing it between my thumb and forefinger. It reduced from 1.090 down to 1.075 where it stopped. I noticed that the case cannelure is not as aggressive on this batch of DPX ammo when I compared it side by side with my .380 DPX ammo and my 9mm Powerball ammo. I am not able to squeeze any of my powerball bullets deeper into their cases nor am I able to do this with any of my other factory ammunition except the 9mm DPX.
I have a few questions:
Is this ammo safe to fire? I have serious concerns about the amount of setback and the fact that there does not seem to be adequate case neck tension to prevent further set back. I should not be able press the bullets deeper with my fingers.
What is the minimum safe overall length for this cartridge loading?
How short can this OAL get before a dangerous pressure situation will occur?
What is the factory spec OAL for this cartridge?
I have the original box, the UPC code is 7 57750 09980 7
Thanks your help,
Jason Hight
I emptied all this stuff out of my mags and replaced it with my 124gr XTP handloads for now. At least I know they will pass the push test.
I sent the following to Corbon via their website just know. I'll post up their response when I receive it. I hope they are responsive.
Hi,
I carry Corbon DPX 95gr ammo in 9mm. I recently inspected my loaded magazines and found multiple rounds with significant bullet set-back. About half of the rounds measured between 1.10-1.14" for cartridge overall length. A few of my rounds measured less than 1.10, with the shortest measuring 1.082. I unloaded and set aside all of the rounds that measure less than 1.10".
I was able to seat a bullet deeper into the case simply by squeezing it between my thumb and forefinger. It reduced from 1.090 down to 1.075 where it stopped. I noticed that the case cannelure is not as aggressive on this batch of DPX ammo when I compared it side by side with my .380 DPX ammo and my 9mm Powerball ammo. I am not able to squeeze any of my powerball bullets deeper into their cases nor am I able to do this with any of my other factory ammunition except the 9mm DPX.
I have a few questions:
Is this ammo safe to fire? I have serious concerns about the amount of setback and the fact that there does not seem to be adequate case neck tension to prevent further set back. I should not be able press the bullets deeper with my fingers.
What is the minimum safe overall length for this cartridge loading?
How short can this OAL get before a dangerous pressure situation will occur?
What is the factory spec OAL for this cartridge?
I have the original box, the UPC code is 7 57750 09980 7
Thanks your help,
Jason Hight