« previous next »
Pages: [1]   Go Down

Author Topic: Dirty Brass  (Read 601 times)

Offline Havanagunner

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 85
Dirty Brass
« on: January 10, 2011, 10:40:35 AM »
After shooting my Ruger PC 40 and my Springfield XDM in 40 S/W I have noticed that the brass is really dirty with soot. Logic would tell me that I am not getting a clean burn and thus not getting the full potential from the rounds. I am using Winchester AutoComp at 7gr with the Hornady XTP 155gr, Winchester primer's, and several diffrent types of  brass, using what I think is a light separate staged crimp. Any thoughts or help would be appreciated.
Logged
Passion has with it responsibility. Responsibility creates a desire for knowledge. Knowledge brings about understanding

Offline Grumblecakes

  • Site Supporter
  • Trade Count: (3)
  • Hero Member
  • *****
  • Posts: 575
Re: Dirty Brass
« Reply #1 on: January 10, 2011, 12:35:18 PM »
i get soot on my cases too. some powders are just dirty. I use bullseye and it happens to me. I never really worried about it cause the gun(s) shoot great and the brass shows now signs of unsafe pressure.
Logged

Offline Nealio

  • un-Certified Tanfoglio Armorer
  • Trade Count: (11)
  • Hero Member
  • *****
  • Posts: 1144
  • Team European Steel
Re: Dirty Brass
« Reply #2 on: January 10, 2011, 06:45:44 PM »
I shoot the same powder (PowerPistol) in my 9mm, 10mm, and .45 ACP.  Only my .45 ACP cases are sooty.  I always assumed its because there wasn't enough pressure to get the case mouth to expand and seal properly.  I was getting soot on my 10mm rounds back when I was using Blue Dot, but I increased the crimp and that helped.
The Winchester site is saying the load you listed is rated at 25,800 PSI, so if you believe my theory on it not sealing, that could be the issue.
Logged

Offline Havanagunner

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 85
Re: Dirty Brass
« Reply #3 on: January 11, 2011, 12:10:21 AM »
Thanks I will give it a try and report back.
Logged
Passion has with it responsibility. Responsibility creates a desire for knowledge. Knowledge brings about understanding

Offline Nomad

  • Site Supporter
  • Trade Count: (18)
  • Hero Member
  • *****
  • Posts: 3011
  • Outdoor sports
Re: Dirty Brass
« Reply #4 on: January 11, 2011, 06:09:18 AM »
 Tumbling brass and cleaning it before sizing helps keep your dies from
being scratched from the carbon it may have collected....As well as scratching
your brass....   
Logged

Offline Idaho_Gun_Nut

  • Site Supporter
  • Trade Count: (4)
  • Hero Member
  • *****
  • Posts: 810
Re: Dirty Brass
« Reply #5 on: January 11, 2011, 08:27:42 AM »
If you don't have one, get a Loaded round crimp checker to see if you are putting enough crimp on your rounds.  Too light of a crimp in a semiauto can cause the rounds to shift and push a bullet back into the case which can cause higher pressures when fired which can cause "BOOM" and scrap metal.  Lee sells the round checkers, they're fairly inexpensive.  You'll thank yourself for buying it!  You may also notice better feeding after adjusting your crimp properly as well.
Logged
Μολὼν Λαβέ
"They that can give up essential liberty to obtain a little safety deserve neither liberty nor safety" Benjamin Franklin

Offline TrooperBrian

  • Trade Count: (2)
  • Hero Member
  • *****
  • Posts: 1509
Re: Dirty Brass
« Reply #6 on: January 16, 2011, 03:24:20 AM »
I used to use Bullseye, it was pretty dirty. Switched to Titegroup.
Logged
"I'm not a big believer in "it can't be done". Those who usually say that generally turn out to be ether ignorant or lazy..." -Mr Blasty, Glock Talk

“Carrying an empty chamber is like, well, having a smoke detector with an air filter.” -Jimbo45

Offline Havanagunner

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 85
Re: Dirty Brass
« Reply #7 on: January 16, 2011, 10:05:46 AM »
Thanks everyone. It looks like I have some work ahead of me. But that means I have to go out to the range and shoot more. ooh darn the luck.
Logged
Passion has with it responsibility. Responsibility creates a desire for knowledge. Knowledge brings about understanding

Offline Precise

  • Site Supporter
  • Trade Count: (8)
  • Hero Member
  • *****
  • Posts: 418
Re: Dirty Brass
« Reply #8 on: January 16, 2011, 07:05:32 PM »
Quote from: TrooperBrian on January 16, 2011, 03:24:20 AM
I used to use Bullseye, it was pretty dirty. Switched to Titegroup.

+ 1 on Titegroup
Logged
"I’d rather be governed by 2,000 random names in the Boston phone book than the faculty of Harvard." William F. Buckley Jr.

Offline RGinIdaho

  • Site Supporter
  • Trade Count: (14)
  • Hero Member
  • *****
  • Posts: 861
Re: Dirty Brass
« Reply #9 on: January 17, 2011, 06:09:49 AM »
I wouldn't stuff titegroup in a .40 on a bet. Try something a little slower, say WSF.
Logged
Some people are like Slinkies - not really good for anything, but you can't help but smile when you see one tumble down the stairs.

Offline RGinIdaho

  • Site Supporter
  • Trade Count: (14)
  • Hero Member
  • *****
  • Posts: 861
Re: Dirty Brass
« Reply #10 on: January 17, 2011, 06:14:29 AM »
Recommended taper crimps for semi auto pistol cartridges:

9mm     .3785
40s&w .420
10mm  .4205 - .4210
45acp   .470
Logged
Some people are like Slinkies - not really good for anything, but you can't help but smile when you see one tumble down the stairs.

Offline Grumblecakes

  • Site Supporter
  • Trade Count: (3)
  • Hero Member
  • *****
  • Posts: 575
Re: Dirty Brass
« Reply #11 on: January 17, 2011, 06:43:05 PM »
"I wouldn't stuff titegroup in a .40 on a bet. Try something a little slower, say WSF."

i would. now firing it is a diffrent matter  ;D
Logged

Offline egress81

  • Site Supporter
  • Trade Count: (12)
  • Hero Member
  • *****
  • Posts: 871
Re: Dirty Brass
« Reply #12 on: January 17, 2011, 09:15:28 PM »
whats wrong with titegroup and .40?    It is listed in quite a few manuals for a couple different bullet manuacftures.
Logged
Ejection seat test Dummy

Offline RGinIdaho

  • Site Supporter
  • Trade Count: (14)
  • Hero Member
  • *****
  • Posts: 861
Re: Dirty Brass
« Reply #13 on: January 17, 2011, 09:42:44 PM »
Caliber heavy bullets and fast powders in major pf .40 loads have been the underlying cause of most .40 kabooms.

A short summary; http://www.precisionbullets.com/PDF/maashl40sw.pdf

A little more digging will turn up more of the same.
Logged
Some people are like Slinkies - not really good for anything, but you can't help but smile when you see one tumble down the stairs.
Pages: [1]   Go Up
« previous next »