Author Topic: Dented Brass  (Read 211 times)

ML

  • Newbie
  • *
  • Posts: 6
    • View Profile
Dented Brass
« on: August 31, 2017, 05:10:40 PM »
New member here. My last batch of reloads was a step up in grains of Accurate No7 but still under max. The bulk of my brass had a dent extending down from the case mouth about a 1/4 inch on one side. Looks like case is hitting ejection port. The gun is a stock G20 Gen 2. Brass is once fired SIG.

Load: 155 grain XTP
         12.4 grains Accurate No 7
         OAL 1.25

My previous load with Accurate No 7 was the same except with 12.0 grains. Both loads shot well and did not exhibit any obvious signs of over pressure. Any thoughts on what is going on and how to correct?   

Thanks. Sorry for large image. Still learning the ins and outs of image posting.

The_Shadow

  • Moderator
  • Sharpshooter
  • *****
  • Posts: 7282
    • View Profile
Re: Dented Brass
« Reply #1 on: August 31, 2017, 06:21:08 PM »
Was this from the Desert Eagle pistol in the other post?  It looks like the brass was trapped by the extractor as the slide ran forward.  In other words it may have been tightly held as the next round tried to rise up pushing up the spent casing and crushing on the barrel hood.
The "10mm" I'm Packin', Has The Bullets Wackin', Smakin' & The Slide is Rackin' & Jackin'!
NRA Life Member
Southeast, LoUiSiAna

Texashogman

  • Jr. Member
  • **
  • Posts: 124
    • View Profile
Re: Dented Brass
« Reply #2 on: September 01, 2017, 10:41:13 AM »
Was this from the Desert Eagle pistol in the other post?  It looks like the brass was trapped by the extractor as the slide ran forward.  In other words it may have been tightly held as the next round tried to rise up pushing up the spent casing and crushing on the barrel hood.
his post says G20 gen 2 --- with the scrape and dent it still looks like the slide is hitting the brass--ejection port dings are not that severe, and don't have those scratches on them--almost looks like it could have been close to a stove pipe?
« Last Edit: September 01, 2017, 10:47:01 AM by Texashogman »
RIA 52000, PVL chest holster, Montana 200WFN

5 dollars waiting on 5 cents

ML

  • Newbie
  • *
  • Posts: 6
    • View Profile
Re: Dented Brass
« Reply #3 on: September 01, 2017, 10:46:13 AM »
The gun is a stock G20 Gen2. The gun should have been fairly clean when this happened and has not been fired since. I will run some factory loads thru it this weekend and see what happens as I did not have any factory ammo with me at the time when the case denting occurred. Never thought about trapping by the extractor. 

If the slide is hitting the brass what would be the root cause of this? I will do a control shoot with some SIG factory 180 grain I have that has always shot well in the gun.   

sqlbullet

  • Moderator
  • Sharpshooter
  • *****
  • Posts: 5628
    • View Profile
Re: Dented Brass
« Reply #4 on: September 01, 2017, 01:05:59 PM »
When I see brass mangled to this extent I usually suspect that the brass is not fully clear of the ejection port when the slide returns to battery.  I would check extractor tension and ejector length.  Correct as needed.

ML

  • Newbie
  • *
  • Posts: 6
    • View Profile
Re: Dented Brass
« Reply #5 on: September 10, 2017, 05:24:48 PM »
An updated. I replaced the extractor, depressor plunger, plunger spring and bearing. This corrected the problem of my brass collapsing at the case mouth. None of the old extractor components appeared to have any obvious defects or damage. The new spring did seem to be of a stouter construction. I think I got a little tunnel vision on the problem as it happened while working up a load.

Thanks for the help

sqlbullet

  • Moderator
  • Sharpshooter
  • *****
  • Posts: 5628
    • View Profile
Re: Dented Brass
« Reply #6 on: September 10, 2017, 10:55:04 PM »
Glad you worked out the issue.