I have seen discussion of rook rifles at:
http://www.castbulletassoc.org/forum/
I have READ of, not done business with
http://www.deltagunshop.com/
http://www.cutrifle.com/
http://www.johntaylormachine.com/
I had a barrel relined at:
http://www.redmansrifling.com/index.htm
but he does reboring, too.
It won't be cheap.
You could cast teeny little bullets for the Hornet and call it a .22 WCF or pretend it was a .297-230 Morris.