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You really need to back up that chrony. I don't know if the numbers you're getting are right or not but 4 feet is WAY too close. The data published in manuals is almost always from 15 feet. It is pretty much the standard distance.
I'd be shocked if you could get reliable numbers from anything besides a 22 at 4 feet. I've never been able to get good readings from less than about 10 feet with my Beta Chrony, even with a .204Ruger.
My Glock literally rocks the tripod from 5 feet or so. Not just wiggles, it rocks the thing, almost tips it over.
Back it up to 15 feet and THEN we can discuss your velocities, good, bad or indifferent.
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Nobody plans to screw up their lives...
...they just don't plan not to.
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