I bought a new KelTec P3AT and took it to the range today after stopping home for a quick cleaning (no fluff-n-buff).
I fired 228 rds of ammo through it at the range. 50 rds S&B, 50 Rds Winchester White Box and 28 rds of Corbon 90gr +P. I expereience four failure to ejects, all on the **corbon** ammunition.
Here are the empty cases from the last seven rounds of corbon that I fired through the gun:
and
Note that I fired only about 28 rds of FMJ through the gun before trying some Corbon. All of the Corbon brass was bulged this way, but most extracted and ejected flawlessly.
I thought that this bulging and case deformation may have been caused by the feed ramp impacting the bullet head of the next round in the mag and causing it to be seated deeper and thereby increasing the case pressure. But how far down does the bullet have to go before the pressure is increased? I checked for the "smiley syndrome" on both the FMJ and the JHP rounds frequently and only noticed a hair trace of it on the Corbon JHP ammo and none on the FMJ. The JHP bullets did not appear to be pushed in as the cartridge in the mag appeared to be the same height as one fresh from the box to my naked eye. Unfortunately I did not have calipers with me.
Does anyone know what could be causing this? I would like to carry Corbon in my P3AT but will stick with S&B FMJ for now. Thanks for your time. KTRange is a great place!
I fired 228 rds of ammo through it at the range. 50 rds S&B, 50 Rds Winchester White Box and 28 rds of Corbon 90gr +P. I expereience four failure to ejects, all on the **corbon** ammunition.
Here are the empty cases from the last seven rounds of corbon that I fired through the gun:

and

Note that I fired only about 28 rds of FMJ through the gun before trying some Corbon. All of the Corbon brass was bulged this way, but most extracted and ejected flawlessly.
I thought that this bulging and case deformation may have been caused by the feed ramp impacting the bullet head of the next round in the mag and causing it to be seated deeper and thereby increasing the case pressure. But how far down does the bullet have to go before the pressure is increased? I checked for the "smiley syndrome" on both the FMJ and the JHP rounds frequently and only noticed a hair trace of it on the Corbon JHP ammo and none on the FMJ. The JHP bullets did not appear to be pushed in as the cartridge in the mag appeared to be the same height as one fresh from the box to my naked eye. Unfortunately I did not have calipers with me.
Does anyone know what could be causing this? I would like to carry Corbon in my P3AT but will stick with S&B FMJ for now. Thanks for your time. KTRange is a great place!