Ahhh.. at last the full sequence...
I don't think that Vic has the last 2 photos himself...
The first pix is well known and in Graheme Wright's book..

Photos were taken by Cal Carrick.. (inventer of the Bionic Arm for buff catching)

Gun is a 500 3"NE Evans IIRC..

Location was Adelaide River floodplains, not far from Scotts Creek?

I'll ask him tomorrow..