yeah heard of some brewery doing this when the beer is 1 plato from FG to achieve their desired carbonation level every timerack early into a keg with the speer cut of, connect PRV and finish ferment.
saves Co2 and is gassed when transfered to storage keg.
called spunding I tink
brads, get yourself a copy of brewmate. it has a carb calculator - as well as numerous other calculators for free!
just enter your L and desired carb level and away you go
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