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I've been tasked with making a sub-sonic load for a rifle with a can on it. Does the can add velocity like barrel length does? My gut level instinct says no because the gasses are venting into the can. What say you all with greater experience in such matters. I plan on getting the CV Arms single shot and having the barrel cut to 16" and threaded but thought I could do the load development while I wait for the suppressor to get out of jail.