I've only ever caught one, and it was a by-catch of shark fishing so my info may not be all that helpful :laugh:
All i remember is that i had 50pd line, 80pd trace and bait was half a pilly on ganged hooks. Tide was running out and it was about half way down and was caught adjacent to a rock wall, which is about the only reason why I landed a jack. Even on that gear it pulled like a mofo on roids, and from memory went over 50cm. Also, that was in the Logan river past carbrook, so in hindsight I should've bought a lotto ticket that night too :laugh: