A review of my references did not show usage outside of shotguns, but internet searches showed possible use on both shotguns and some later rifles to include a late M70.
As an earlier poster noted, leave it be as it would be terrible to discover later it belong there.
Your better bet than here would be to take pictures and post on a Winchester specific board.
You could also try to get a letter from the Cody Museum on the serial number, if they are lucky enough to have records on it. Some Model 70 records exist, but they are incomplete.
