I also have a Lee Speed who's barrel has seen better days, I doubt that you will find a barrel liner,they're just not made for higher pressure cartridges, about the only way to get one would be to turn down a normal barrel and good luck with that. So you're left with finding a good used barrel or buying a new one, TSE could no doubt make one for you but it will not be cheap. I was looking at the Mosin Nagant take off barrels on ebay, the Russian ones are chrome lined which makes rechambering difficult but I'm left wondering if the Finnish ones were chrome lined as well, if not then that may be worth a look if you can get one sent to Australia. Reboring is also not an option as far as I know, if you find someone let us know so i can get mine rebored