I think most of the old ads significantly overstated the velocities on factory loads back then. I can't speak to published data from 1900, but the info from the factories in the 1960's and 1970's was surely exagerated. There is a thread on this forum from a year or so ago where several LEO from that era (including myself) expressed this opinion. That changed in the 1978/79 timeframe with the new testing requirements for revolvers ammo. This may be why for many years the Secret Service loaded their own ammo in the basement of the Treasury building in DC. Just my opinion.