Crag.
Numrich arms
Find an appraiser
Cant find information on a kessler bolt action rifle from 1950
Need the maker of the shotgun
Rifles have bolt actions and I've never seen a bolt action on a shotgun or handgun
I would first look at numrich gun parts.
If your Stevens is a bolt action, it is NOT a visible loader. If it has any part (perhaps the barrel) that is marked as a visible loader, that part has been replaced.
I would look at Numrich gun parts corp first.They may be found on the web.
They did make .270 barrels for conversions of other firearms, but I'm unable to find any references to them ever manufacturing a bolt action .270.
http://remingtonsociety.com/rsa/service or e-gunparts.com The may not sell bolts direct due to fitting an liability.
Blue Book of Gun Values
Try egunparts.com
BLue Book of Gun values