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6.01's are not losing FPS because of airflow... what the heck are you talking about.
It should be the opposite., your have LESS internal volume, so you would need LESS air to push the bb.
Ir reduce FPS because the BB will bounce a LOT more on the inside of the barel, thus reduceing the speed.
It will however help stabilise the flight before exiting.
Best bore is 6.03 under that, you start to lose FPS, above that, the effect can be better.
I am using 6.04.
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