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Cheflife15

Issues with subsonic 9mm ammo

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5 minutes ago, Krdshrk said:

Technically 147gr 9mm is usually subsonic out of a 5" or shorter barrel.  

Every subsonic I tested through the about 9" barrel of a MP5 or PCC stayed subsonic through a chronograph.  Most PCCs lost some velocity compared to firing through a pistol.  My guess is the powder is consumed and barrel friction comes into play.

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