I used to see lots of browns at a property i used to work near Bungendore NSW , and i saw quit a few around that size over a period of 9 years0. Though most were around 1 to 1.5 metres. There was plenty of rats , mice and rabbits around to feed on. Plenty of bluetounges , shinglebacks , cunninghams and beardies as well. Was a great place to work for someone who is nuts about reptiles.