The one other circumstance which i can imagine is usually that it could be a normal Model 70 barrel and action having a alternative XTR stock. That is unlikely however...I suspect that it's when you describe, an unmarked XTR. The center from the rifle is the classic Model 70 motion https://titusjynbo.goabroadblog.com/26507224/facts-about-winchester-model-70-xtr-featherweight-value-revealed