The sole other state of affairs that I can envision is usually that it could be a typical Model 70 barrel and action which has a replacement XTR stock. That is unlikely even though...I think that it's as you describe, an unmarked XTR. The heart on the rifle is definitely https://winchestermodel70featherw60494.howeweb.com/27337704/rumored-buzz-on-winchester-270-featherweight-review