My friend that was in the prison service replied this:
"The NSW Govt issue round was a Winchester 158Gn FMJ RN"
He added that they later switched to Winchester 125 gn hollow points due to poor performance from the 158 gn ammo. He told me a funny story that I've requested permission to post here, I'll let you know if he gives his OK.
Another Aussie in West Australia said that LEO's there used mostly Winchester 110 gn HP in the .38's. Both added that most all have switched over to .40 Glocks now So, there you are!
Dan
W