it would seem to me that if you had a thick ring bow and thin ring bow both holding same amount of reflex and about the same mass,, there would be little difference in cast,, it might be easier to get a thin ring stave to hold reflex,, but I am not sure about that ,, I had a stave from David Mims,, the rings were so thick .. I have never made a bow from something like that,, I think the whole bow was 2 rings,very light yellow, anyway my friend made a bow that ended up about dead even,, it shot very well through the chronograph,, and went against what I thought was going to happen,, very nice shooting bow and great cast,,,I think in the bow mentioned above, the amount of reflex might be contributing to the great cast as much or more than the thickness of the ring,,over all osage can just make some great shooting bows in any configuration that holds together,,