A guy in another forum bought a #1 in 219 Donaldson wasp with a 24 inch heavy barrel. He brought it to show me........looks legit with what looks to me to be factory rollmarks. A one-off perhaps. Very nice walnut stock too!
Never heard of one chambered in that caliber but it could be original. I have on chambered in . 17 Remington but it's been rebarreled. Your friend can call Ruger and they will tell him what the rifle left the factory as.