No doubt Oberndorf did produce sporting rifles in 30-06, I happen to have a barrel off one.
It has a small shank and would no doubt fit quite nicely into your action. If the mag. etc
is not long enough I don't believe it's a big deal to lengthen things to suit. My barrel hopefully
is destined to be fitted into a 22H Brno action I have kicking about, they look quite well together.
Even the scratching on top of the bridges and barrel rib match up quite nicely.
--- John