I believe that IDPA rules strongly encourage making COF's revolver friendly, I think 18rds is the maximum (supposedly)?
So, I wouldn't think 6rd capacity would be much of a handicap.
My wife on the other hand, shooting a 7rd revo has to line up the empty when reloading ;-)... I think the local folks wouldn't care if she loaded 7 though.
Meum scapha volitare plenum anguillae