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The 20gr result was a bit odd. It had a hi value of 1277 ft/s and a lo value of 1040 ft/s and everything in between, hence the low average.
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That's a chronograph error of some sort, I'd bet.
You should be at least 10, more like 15, feet from the chrony. 15 feet is pretty much "the" standard.
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Still happily answering to the call-sign Peetza.

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