A typical post WW I German sporting rifle modified to fit American tastes of the 1960s.
Original equipment includes double set triggers, shotgun type trigger guard, lever magazine floorplate release, and ribbed octagon barrel. A very handsome rifle in its day, built on a '98 Mauser action. Maybe ex military by the thumb notch in the left rail.
Changes to suit Yankee tastes include California Weatherbyish stock and Austrian scope mounted in an American Pachmayr pivot mount.
I do not see a front sight. Is there one or at least a base for it? I'd hate to think of a complex contour barrel like that sawn off to be "handy in the brush" but a lot of rifle barrels were shortened in those days.
Isn't there an inscription around the breech end of the barrel? What does it say?