Thousands at a penny each? Care to share the source of that buy? And the date?
The natural limits of a work up are:
4 gr Power Pistol, no one can stand the recoil
4.5 gr most powder that will fit without double compression
5.2 gr most powder with long brass life
6 gr primer falls out, case sticks in chamber
Beyond currently published data....I can see that. "Natural limits"?? That is a new expression for me in this regard. I have not seen any load data for the little .25 that specs more than two grains of anything (admittedly faster propellants). These loads are more suitable for the 9mm Luger.
Source of this data? Velocity and pressure data? Type of firearm used to gather the data?