I have a M/H in this caliber and would like to start reloading for it. Can anybody help with suggestions for getting the brass and dies.
I live in Sydney, Australia.

CH4D should have the dies - they have everything else.

http://www.ch4d.com

Brass for the .577/.450 Martini Henry is produced by Bertram Brass in Melbourne. I'd order some through "Pro-Cal Trading" in Sydney (03)52811380. For reloading dies in this calibre I'd enquire through "Toys for Big Boys" in Adelaide (08)86484672. There was a excellent article on reloading for .577/.450's in the March 1999 Shooters Journal. Check with the SSAA for back copies or I could provide some extracts.

Good shooting.