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how to determine if subsonic

Discussion in 'GATE Self-Defense Forum' started by olympicmotors, Jul 29, 2010.

  1. olympicmotors


    May 24, 2009

    You have mentioned several times on this forum to make sure to use supersonic rounds in the 155 - 165 grain 40 caliber Speer Gold Dots.

    I do not have access to a chronograph , I just thought all the gold dot rounds were standardized and the only difference in them was the grain.

    My box says:

    Speer LE
    Gold Dot
    duty ammunition
    40 S&W 165 GR. GDHP

    This is a 50 round box I purchased online from

    How do I know if these are the full power rounds?

    I was carrying 180 grain but have switched to the 165 as per your recommendation.

  2. Mas Ayoob

    Mas Ayoob KoolAidAntidote Moderator

    Nov 6, 2005
    Product code for the Speer Gold Dot 165 grain .40 S&W in full power loading (1140-1150 foot seconds nominal velocity) is 23970. Speer is not currently listing a 165 grain subsonic in the Gold Dot series.