As mentioned, it'll likely be more than a simple rebore and chamber job.

Keep it and get one of the new ones offered in 6.5x55 Swede.

I'm trying to get mine to the shop for a rebore from 22-250 to 250 Savage.
A 14 twist 22-250 has little appeal for me, I bought it for a song, and the 250 Sav conversion should be straightforward. Otherwise I'd be in line for one of those Swedes.

“Life is life and fun is fun, but it's all so quiet when the goldfish die.”