If the end goal is to build a truly lightweight rifle, why would a person not start with a truly lightweight action? Yes, you can get a Model 70 reasonably light, but to use the lightest stock available on the market to build a rifle that won't be the lightest that you can produce is somewhat counter intuitive. You end up with a rifle that, unless you shorten the barrel dramatically, will be strangely barrel heavy and won't handle as well as it could.
Think running "E" load range tires on your SUV. Sure, you can, but it's not going to make a real difference to what you an do with the platform as a whole. Sure, you could tear out the running gear and upgrade it to 1-ton axles and suspension, but you still don't have a 1-ton pickup.
As pointed out... They don't gotta be ultralight.... That's just an option Stuart offers. They're good stocks...if I were putting a Win into one it would be like the photo above (wildcat rem stock inlet for a win)... I'd hate myself if I spent good money on that schnabel thing...




















































