Black cases.

dearslayer

dearslayer

Regular
Rating - 100%
11   0   0
Location
On The Edge
Last trip to the range I took along my Ruger PC9 to shoot some reloads. Some were Win231 and some were CFE pistol. I had a brass catcher on the rifle so I'm not sure which case was from which powder but some spent cases were really black with carbon and some not so much. What would cause this? Both powders produced fairly good accuracy results at 50 yards.
 

Attachments

  • IMG_20230508_222356.jpg
    IMG_20230508_222356.jpg
    53.5 KB · Views: 273
Problem with PCC is the blow back marks the cases as well as the inside of the pcc. This is the spent gunpowder that pushes back on the bolt to operate the action. I have had a ruger and now have a k9 and both get very dirty pretty fast.
 
I have found shooting Winchester white box 9mm ammo through my PCCs almost always causes this black burnt look. It is definitely the ammo, since other calibers of WWB have the same effect.
 
Halifax1977 said:
Was this a powder charge that was on the low end? Light powder charges keep the case from expanding and creates sooty cases.
Click to expand...

It could have been. These were loads I done for pistol . I just grabbed a bunch of copper plated and a bunch of powder coated cast loads and never paid much attention. I went to the pistol range 1st as the main reason for going and it was an afterthought to take the PCC Long. Those loads may very well have been on the light side now that I think about it.
 
thegazelle said:
I have found shooting Winchester white box 9mm ammo through my PCCs almost always causes this black burnt look. It is definitely the ammo, since other calibers of WWB have the same effect.
Click to expand...

Anything Winchester white box runs dirty, Barnaul is the other ammo that tops Winchester in terms of being dirty, also smell like crap
 
dearslayer said:
I kinda get that but why would one load be different than the other? Perhaps just one being just dirtier or hotter burning?
Click to expand...

A lot of factors go into it creating conditions for chamber blow-by. Mostly, you have a different pressure curve in combination with the unlocked breech of a straight blowback action. The action can start opening before the bullet has left the barrel. Straight blowback actions generally want factory-spec ammunition for this reason, and even then some bullet weight / powder combinations will work better than others.


Halifax1977 said:
Was this a powder charge that was on the low end? Light powder charges keep the case from expanding and creates sooty cases.
Click to expand...

Agreed, probably the biggest factor at play.
 
I shoot a fair bit of WW231 in handguns and it is definitely a fairly dirty/sooty powder compared to many others. That combined with possible light loads and blowback operation is the most likely cause of the sooty cases.


Mark
 
Both loads were quite accurate at 50yds so that wasn't a concern. I just wanted to be sure there wasn't something I was missing that I should be worried about. Other than that it's all good. I did notice that the same loads to not produce the same black cases in the pistols.
 
so far I've only tried factory Winchester and S&B on the ruger PC

the Winchester was dirty just like in your picture

S&B was slightly better
 
You must log in or register to reply here.
Back
Top Bottom