Oz:
Here are a couple of visual comparisons that may be useful:

1. M-1903 Mannlicher Schönauer 6.5x54 sporting carbine on left,
Greek 6.5mm Military Mannlicher on the right:

2. M-1903 Mannlicher Schönauer 6.5x54 sporting carbine on left,
M-1910 Mannlicher Schönauer 9.5x57 sporting rifle on the right:

Cute, hey!

Also, note the significant difference in 1st cartridge recess, between Clark's 1903 and both my 6.5s. Don't know what's going on there! You can see another Greek(?) magazine in Mike Bailey's second photo on the "new" Mannlicher thread, its the same as my two 6.5s.
Interesting!