Thanks for the replies, guys. I've been out a few days.

I think someone wanted a Mannlicher-Schoenauer but didn't want to pay for one, although I can't imagine this custom job ended up being much cheaper in the long run.

Webster: yea it was definitely a labor of love for some gunsmith at one time. His attention to detail was pretty nice, checkering the underside of the bolt, squaring off and checkering the safety, fabricating a cocking piece aperture, in addition to the magazine conversion are really nice touches. It shoots good too.

Grasshopper: PM sent on the dies. My gunsmith, 60+ years in the business, actually has load data for this cartridge with 100 to 160 grain loads. He knew exactly what I was talking about but said it had been over 40 years since he'd been asked to load any. But yea, outside of some ancient military surplus, it's unlikely that Federal or Hornady will start loading the old Dutch any time soon.