Not quite the same thing, but a relative brought back from Europe a beautiful German Mauser sporter but couldn't find any ammo for it. He had gone to or written (pre-email) every place, with no luck. He asked me to find him some ammo, cost no object, he would pay anything reasonable and take all I could find.
I didn't take him up on the offer, but I was sorely tempted to order him a freight train full. The rifle was marked "7.62x63".