When shipping UN 3077 as LTD QTY, the DGD should show Gross weight and the maximum is 30kg G.
For Excepted Quantity, the maximum is 1kg net per package. For UN packaging PI 956, the maximum is 400kg net per package whether on passenger or cargo aircraft. Effective with the 52nd Edition DGR, the use of IBC was introduced where the maximum is 1,000kg net. Since this is a newly introduced procedure, it is advisable that the shipper will make advance contact with the airline.