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Bullet Velocity

Discussion in 'The 10 Ring' started by Sierra9, Nov 19, 2011.


  1. Sierra9

    Sierra9
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    Joined:
    Jan 31, 2009
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    Has anyone chronographed any given bullet fired from a stock G29 versus a G29 with an extended barrel? I plan to do this when I get my just-ordered KKM 4.75" barrel, but I'm interested in the experience of anyone else.
     
  2. AA#5

    AA#5
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    Joined:
    Nov 26, 2008
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    You may find that you actually lose some velocity. The Glock's polygon rifling allows a substantial velocity gain over the aftermarket barrel with standard rifling.
     

  3. TDC20

    TDC20
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    Joined:
    Apr 11, 2011
    1,006
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    A very rough estimate is 75fps per inch of barrel length. A little bit more for light bullets at higher velocity, maybe a little less for heavy bullets at lower velocity. This is based on my results with a G20 4.6" stock barrel vs. a LWD 6" barrel. It could (and probably does) vary a little bit with the shorter G29 barrel.

    That should get you into the ballpark.
     
  4. _The_Shadow

    _The_Shadow
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    Ret. Fireman

    Joined:
    Jul 23, 2007
    4,518
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    Location:
    Southeast, LoUiSiAna
    Here is a target load I shot from two different barrels...
    10mm June 27, 2009 test
    S&W 1006 with factory barrel 5.00”
    Temps 99 °<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:eek:ffice:eek:ffice" /><o:p></o:p>
    <o:p> </o:p>
    Lyman 156.0 gr Devastator HP 0.401&#8221; 1.255&#8221;
    Power Pistol 7.2 gr CCI 350
    Velocity 1115-1138 fps
    Primers OK
    <o:p> </o:p>
    Glock 29 with factory barrel 3.78&#8221;
    Temps 99 °<o:p></o:p>
    Lyman 156.0 gr Devastator HP 0.401&#8221; 1.255&#8221;
    Power Pistol 7.2 gr CCI 350
    Velocity 1009-1053 fps
    Primers OK
     
  5. gator378

    gator378
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    Gator378

    Joined:
    Jan 22, 2001
    508
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    Location:
    St. Peters, Mo, USA
    My G20 Barsto barrel is always at least 20 fps faster than the Glock barrel. This has been true the last few years consistently. After going through 2 OEM glock barrels that had really bad smileys, The first thing that gets modified on the glock is the barrel is replaced. Not a fan of Glock barrels or the polygon rifling. Otherwise they are very good and reliable and almost indestructable pistols. A few thousand rounds threw mine and no problems yet except for the occasional spring whose lifespan has been exceeded by about 300%