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Without knowing more we don't really know what it is. If OP can come back and let us know then we could get it closer. I find that gunbroker is pretty good for guessing what it may be worth as they...

The op had mentioned winchester and winchester does make a bolt action 270.

Try looking here.

Guns for Sale - Online Gun Auction - Buy Guns at GunBroker.com

Its an online auction and they have many listings.