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Powder burns on casings?

Discussion in 'General Glocking' started by inky0ct0pus, Nov 20, 2012.

  1. inky0ct0pus

    inky0ct0pus

    11
    0
    Nov 19, 2012
    I posted this earlier somewhere else, but hopefully there is a more specific knowlegebase here..

    Hello, I just bought a Gen 4 Glock 21 and shooting it today I noticed that on every casing, there were significant powder burns on one side. The burns go down to a little over half-way.
    I shot three different brands.
    Federal 230gr fmj - all casings were burned
    Winchester 230gr fmj - all casings were burned
    Federal Hydro-shok 165 gr hollow point - less burned, but still some.

    Should I be worried about this? Would it affect velocity/ accuracy?

    I wouldn't have even noticed, but a gentleman at the range picking up brass for reloads said he hadn't seen it before. Talking to the shop I purchased it, they suggested I try different ammo.
    * * **

    Thanks
     
    Last edited: Nov 20, 2012
  2. M 7

    M 7

    1,398
    34
    May 22, 2012
    Nope. It is normal and nothing to worry about.

    Depending on the powder used, the amount of soot you will see on fired cases will vary. Premium SD ammo tends to use cleaner flash (the source of a lot of the soot) suppressed powders whereas the cheaper "practice" ammo (FMJs) doesn't.

    It all comes off with a good cleaning.
     

    Last edited: Nov 20, 2012

  3. Tiro Fijo

    Tiro Fijo

    6,281
    7
    May 31, 2011
    It has to do with pressure and case obturation. Cream puff range ammo does not expand the case well and gas gets by it. Also, straight wall cases are worse for this than bottleneck.
     
  4. INEEDMILK

    INEEDMILK

    760
    1
    Feb 1, 2012
  5. SJ 40

    SJ 40

    13,340
    3,019
    Jan 17, 2011
    Vermont
    This.
    The listed Federal HS,older bullet technology now but still at a higher pressure sealed better thus not as much soot down the case.
    SJ 40
     
  6. HK Dan

    HK Dan

    1,402
    0
    Mar 27, 2008
    It's called "Blow by" and the forme poster is ight, its from unde powered ammo. The case does not seal the chamber and the gas blows by, causing the charring. Not a cause for concern.