Tough to give an exact date, may be an "aftermarket" style stock.
Try this.
Can you work the bolt with the safety on? If so, it was made after '85 or so. Prior to 85-86 the Rem 700's needed to be on "fire" to open the bolt.
Also, Remington (in their infinite wisdom

) no longer chambers the .22-250 in a sporter barrel. Can only get them in a heavy barrel now. Stupid.