It's not total bullwackey, but it might be close. When handloading, you should always reduce your loads whenever you change any component and work back up to a safe load.
The problem with military brass, real or imaginary, is the case capacity which can be appreciably less than with a commercial variety of case. Whenever you load the same amount of powder into a smaller container, the pressure will be higher - pure chemistry and physics. So if you are currently loading a max load in a commercial case, that load might be too much for a military case. Also, the strength of the case is not the limiting factor for high pressure it is the strength of your rifle's chamber/barrel. At those pressures, brass at the neck and body of a case flows freely.