I admit to being a fan of the Savage 219 single shots, love my .22 Hornet and still have a .30-30 I haven't done much with.
Have seen a few on gunbroker and such that have been rechambered to other things, one in .219 Zipper, one in .256 Winchester and lately, a .219 Donaldson Wasp which I have always had a fascination for but never owned one.
Is this action strong enough for a high pressure cartridge like that? I would have guessed not, but now I wonder.