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Also pay close attention to the barrel lengths used for the published velocities, especially in handgun cartridges. Usually 7-1/2" to 8-1/4" pressure barrels are used, so there is no barrel/cylinder gap or semi-auto action to bleed off pressure and velocity. It's not unusual for 4" to 5-1/2" revolvers to give more than 100 fps less than published velocities when actually chronographed.
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