At an extremely conservative and totally useless exit velocity of 100ft/sec, your BB is travelling fast enough to clear 310mm in 10.17ms.
Unless your setup was firing over 100 rounds per second, I'm going to have to demand some scientific-ish evidence that you can determine without a shadow of a doubt that barrel suck exists. A lot of gun techs smarter than our little kiddy corner here have debunked it. It's nonsense
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"Mah check"
Now you know
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