Need help with Glock 34 and KKM barrel

[igolfat8]

I have a new Gen4 G34 with a new KKM barrel with a Carver 4 port comp. I am getting black soot on the OUTSIDE of my cases regardless of the powder or load. The soot is only on 1/2 of the case, 1/2 way around it and the whole length of the case.

I can't accurately measure the chamber with the barrel in the slide to confirm if the chamber is oval or out of round.

I am shooting 95 grain and 120 grain powder coated lead bullets. The barrel slugs at .355" and the bullets are sized to .357". I have loaded HS-6, WAC, Titegroup, Bulleseye and Clays. I have loaded minimum to maximum published loads in .2 grain increments. The soot is the same on all loads and all powders. The soot seems to get worse or heavier as the charge weight goes up.

The soot is all over the breech face. It almost seems like the burn is forcing backwards between the case and the chamber, perhaps before the bullet exits the barrel? Is this related to the comp? I have the same set up on my G35 and have never seen this before.


Below are pictures. Has anyone else had any similar problems?

http://pic100.picturetrail.com/VOL891/3760206/24693912/412010012.jpg




Same brass turned 90*
http://pic100.picturetrail.com/VOL891/3760206/24693912/412010014.jpg




Barrel hood:
http://pic100.picturetrail.com/VOL891/3760206/24693912/412010015.jpg




Other side:
http://pic100.picturetrail.com/VOL891/3760206/24693912/412010016.jpg




Chamber:
http://pic100.picturetrail.com/VOL891/3760206/24693912/412010011.jpg

[lefty o]

hard to say without knowing exactly what your doing, but with a comp you want to have your loads on the warmer side. i have the same exact barrel , but with a different comp. mine will soot up with factory cci blazer ammo, but hasnt done it with anything else. my own current load is 7gr hs-6 with a 115gr plated bullets. i run the 5 port sjc comp, and an 11#recoil spring. and my pistol runs perfectly like that.