help please

[mburden]

Ok so I know this is not large ordnance but I would apreciate any information about this round Thanks a lot

- Matt

http://i261.photobucket.com/albums/i...2/IMG_0748.jpg
http://i261.photobucket.com/albums/i...2/IMG_0753.jpg

[Time Bandit]

Just a bit of a shot in the dark...

How about a 577/450 Martini-Henry type round, or a modernish variation of it? It would tie in with the 577 head stamp? It's got the right sort of look to it.