Worst I ever had was enroute from Lightning Ridge (NSW) to Coolangatta (QLD). Left Bankstown early one morning with fine weather forecast. After leaving Lightning Ridge was asked by Flight Service if I had received the SIGMET re: Severe Forecast. Said no and they advised of the SIGMET. I had two very big men in a Seneca. It was looking fine until we got to the mountain range just to the east of Coolangatta and then it hit. Leaving 9000' on descent it was like being in a washing machine. It was the bumpiest ride I have ever had. Encountered wind shear on finals that even made the 767 on approach behind me go around.
Things I would do differently is on being notified of severe turbulence is slow the aircraft up well before entering because once I was in it, it was very difficult to slow. And get my pax to put something soft above their head!
