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Primer markings

Discussion in 'Gunsmithing' started by JMiller, Jan 30, 2010.

  1. JMiller

    JMiller

    92
    0
    Jan 19, 2010
    Heriman,Ut
    I noticed this after reading some reloading books. The books said to pay attention what the primer looked like after firing. I have not run any reloads through this gun yet. I decided I need to see what normal looked like first. This is a Glock 27 I have run around 500 rounds through it. My question is this gun is leaving a different looking hit on the primer then my other guns. I have a G21, G30 and a Kimber 1911. Is this something I need to worry about?
    [​IMG]
     
  2. G-31

    G-31 .357 Sig

    360
    0
    Jul 18, 2009
    Grand Junction, CO

  3. JMiller

    JMiller

    92
    0
    Jan 19, 2010
    Heriman,Ut
  4. Steel Head

    Steel Head Tactical Cat

    16,676
    32,141
    Jan 1, 2010
    A cat box in WA
  5. Noponer

    Noponer

    1,793
    62
    Apr 5, 2006
    North Georgia
    Looks normal.

    The .40 cartridge tends to start the gun out of lockup quicker than other calibers. In the earlier years of the cartridge, that was blamed for the guns being less accurate than other calibers.

    According to a knowledgeable friend, that's why Glock puts more clearance in the .40 chamber... to change the pressure curve & slow down the unlocking action. I believe that design change is more apt to aid a possible KB than the "unsupported" chamber idea. It certainly is the reason for the bulged .40 cases, since the bulge is around the entire case & not just at the 6 o'clock position.
     
  6. luscioman

    luscioman

    45
    0
    Mar 3, 2005
    FL
    Just make sure thethe primer does not "mushroom" or expand out the rear.
     
  7. edrobert

    edrobert

    908
    0
    Dec 18, 2006
    I believe you are asking if the firing pin mark is normal? Yes, if you look at the firing pin on a Glock pistol you will see that it is shaped differently than most pistols which explains the mark they leave. You can typically pick up any brass at the range and tell which were fired in a Glock by the firing pin indentation.