I.D. this case please

[Razor]

Paid $3 for this 'cause I thought it was neat...
Thought it might have been a .577 /450 ?? but the length is wrong..
Overall length = 3.280"
Mouth OD =0.653"
Rim OD 0.731"
Headstamps.. (.577)...{BB}...and two hopping kangaroos
Any guesses ??
My guess was a 577 Battleship {BB}[smilie=1:

thanks

Razor
:castmine:

[Don McDowell]

probably something formed from 577 basic from BB (Bertram Brass) kangaroo's symbolize Australia

[Razor]

Yer right...
.577 basic...
Found it in Dixie Gun works catalog...

Razor