Rolling 20 - From Martin Middlebrook ‘The Berlin Raids’ ‘…the Lancasters of 1 Gp carried the greatest load per aircraft: 4.17 tons…’.
Which, if Google is to be believed, equates to
8 340lbs per aircraft!
Cf a Halifax 1.52 tons to Berlin (c3000lbs) and a Stirling 1.43 tons (2 860lbs)!!!