Anyone chronograph subsonic loads??

I hate to distract people from the beer flu talk.

Still messing with a happy subsonic .300 blackout. For some strange reason the first round seems to be about 15-18% lower than the rest. Is that normal with a suppressor?? 8 rounds, 1st one low, the rest within a couple %. (maybe because I am not using any Diet Dr Pepper.) BTW shooting it dry.

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