B3 internal is a auto rotation and aerodynamic limit with single hydraulics if I understand correctly. Shows you how much power margin you have? Order a new one on the line with twin hydraulics and a TR/stabiliser(do not know the detail-anyone?) mod and bingo you have more internal usage. I believe it is closer to the B4 2400kg(think I read 2380 somewhere on a techno's sb?)? Just speculation from what I think I saw. Still magnificent beast for it's size(B3)
even limited to 2250kg internal.