Could this just be that Winchester specified 4140, and this batch of steel happened to spec a tad off from book numbers? Isnt the tensile strength of modern 4140 under a 100K? If the batch came in and someone at the factory did quality control performance checks, wouldnt this alloy have passed. Would it have been worth Winchesters time and resources to demand .05% less carbon and a pinch of nickel?