The one other scenario that I can imagine is the fact it could be a typical Model 70 barrel and action which has a substitute XTR stock. That is not likely even though...I think that it is as you explain, an unmarked XTR. The perimeters are marginally rounded to attenuate https://winchester-model-70-feath52911.nizarblog.com/26960603/new-step-by-step-map-for-winchester-model-70-featherweight-for-sale