Raimey,
This looks very much like my Franz Sodia 8x57IRS- 16-70/16-70 Drilling, which also has 60 cm barrels. I hope you enjoy it as much as I have enjoyed mine. The scope was remounted from another gun but is a very good "make". I suggest you try it with 11.2-gram bullets first, it may already be sighted in.
Mike