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Velocity gains in long barrels with pistol cartridges

Discussion in 'Rifle Country' started by dispatch55126, Jul 16, 2009.

  1. dispatch55126

    dispatch55126 Participating Member

    Oct 8, 2006
    What kind of velocity gains can be had by shooting 9mm in an 18.5 inch barrel vs. a 4 inch barrel? 9mm has been around for a long time so I know the powder and charge is calibrated for short barrels.

    The second part of this question may be better suited for the reloading section, but would loading a slower burning powder increase the velocity in a longer barrel?

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