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probably a seal getting worked a bit softer and settling in to do its job. the other thing is depending on the type of chrono, some chronos will see a puff of gas and measure it before it measures the BB. you could have had a 270fps puff.
I have a hell of a time trying to chrono my 226 because the chrono sees the gas more often than not... and then when you hold it farther out, the BB never goes through cleanly.
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