I guess I could look up the operating pressures of both, but I have never heard of WBY downloading their cartridges, but we are talking reloading. Looking at several manuals the only time the STW really beats the WBY is with 140g pills and that only by about 100 fps. Hornady even has the WBY slightly ahead when both are using 26" barrels and heavier bullets. Other manuals (Speer and Barnes) show the STW only slightly ahead using 24" barrels. I would say they are pretty close to each other.
I recall reading the STW got its original speed by being in the 70,000 PSI area. A little hot I'd say.
