I remeber reading some where about useing rifle brass to fire form case for loading 20 ga shells . If i remeber corectly they were useing some old English big game shell like 600 nitro or something like that . Any one got any idears ?

No idea but why would you want to? I do not think 20's were ever widely loaded in brass, like the 12 and 10. A cowboy shooter might want brass to replicate early ammo but I don't think the 20 was around then, or very popular.

Use caution with fireformed brass. Its not the best way to work thin brass.

www.midwayusa.com carries brass 20 gauge hulls: http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=860921 I believe they use these for The Cowboy Shooting Sports.

The reason I'm interested in brass cases for the 20ga is that 20ga ammo here in australia is expensive and they never keep much range . I dont shoot a lot of 20ga so buying a loading press doesnt really seam worth the the expence . Reading some of the other post in here , particularly about loading 410's useing 444 , 303 and 9.3 by 74rimed , I was thinking that after the one of expence of getting the brass I would be able to asemble 20ga shells very cheaply and easyily .

Try Magtech brass cases, there are many suppliers. Lagopus..... http://shop2.mailordercentral.com/bpicart/products.asp?dept=202

I've read that the original .600 Nitro Express cases were 20 guage brass cases. I've got an unfired and unsized .600 case in my cartridge collection and it will almost chamber in my 20 gauge shotgun. It's straight, .694" and I believe it would chamber if it was resized to the proper tapered dimensions.

MidwayUSA doesn't export, so perhaps there's another dealer who does. A search turned up this source for .600 brass in your neck of the woods. Not cheap.
http://www.theammodump.com/main.html

Edit: Lagopus has a better idea.

Bye
Jack

Thanks fellas , I'll check out those websights . Checked MidwayUSA and they have brass 20ga cases , I'll just have to see if any these overseas places will export here to Australia . I guess 600 nitro cases would be prity expensive . But maybe they might last long ? Any way thanks for the help Guys .