Rhythmic feel is a very subjective thing.
Let us define feel as 'the relative placement in time of rhythmic elements'.
Roger Nichols (recording and mix engineer for Steely Dan/Donald Fagen and inventor of the Wendel Drum Replacement System) was said to have defined the limit of feel perception at around 250 microseconds for key elements. My own experience watching how certain producers place elements on a DAW project grid brings me to the conclusion that the limit of feel perception is more like 100 microseconds. In any case, people who are very 'feel-conscious' will agree that we are looking at timing shifts well under a millisecond as important and affecting rhythmic feel.
John Klett 1999