This is a damascus barreled 16b pinfire rig, set up for a gamekeeper with a bayonet lug. It shoots quite well.
Those two shots on the lower left corner of the target are the first two I ever shot with it. At that time the patina in the bores matched the patina on the outsides of the barrels. I don't think it'd ever been fired in the 20th century.

This is a fairly close shot of the action on my Mahillon SxS, it is also a pinfire rifle, although it is heavier (not heavy though, the other one is just quite light at seven pounds), has longer barrels, and takes a hotter charge of black powder. It is accurate and very handy.

I have shown these before on this website, so those of you who've seen these please excuse the use of bandwidth.

Oh, and for what it's worth to note, the Lyman .678" roundball mould throws balls of pure lead at around .670"
Should work out great for me too...

--Tinker