This is not the only forum on the internet which addresses old revolvers. You might look to some of the other forums (such as Colt forums) in seeking information such as you need. You might also check the International Ammunition Association (IAA) forum. It is truly international, and many of the members are foreign nationals and you will find that they are extremely knowledgeable about anything related to "antique" small arms ammunition. If you explain your dilemma on the forum, they might well be able to provide some assistance in meeting compliance with Australian firearms regulations (there are quite a few Australians there) or suggest additional ideas you might follow up.