If you know of a cowboy or outdoor bar in your area, donate them as wall decorators.
Heck, just because they're foreign bolt-actions doesn't mean they can't fill space on a bar wall.
Put a plastic cable tie around them so the bolt can't be lifted, before hanging.
You might be able to sell them, but if some idiot blows himself up with them he'll come right back to you with a host of lawyers.
If they're that bad, you may not want to sell them.
As for floor lamps, ewwwwwwwwwww! The only thing more gauche than that is making coat hooks out of deer feet!
You might also inquire if the local theatrical company could use them as props. Theaters will take just about anything.
Heck, "Ivan" and "Yoshi" could conceivably end up in a, "moving testament to the indomitability of the human spirit" play about the Civil War!
I once suffered through a college play, about the Civil War, and I had to laugh at what the "soldiers" carried: Marlin 336, Winchester 94, Stevens single-shot .410, what looked to be a bolt-action .22s and so on.
No wonder the North won! We had cartridge guns!