Lowering the load of a "normal powder" will not work for the following reasons
Smokeless powders burn rate depends on a few things grain size, the use of graphite or other retardent coating and most importantly PRESSURE and dwell time. The higher the pressure the faster the burn rate, retardents are used to control initial burn as is grain size. The idea being a steady increase in velocity and pressure. Shotguns and pistols use much faster burning powders as the requirements are different and a quick boot up the arse works best for them.
A reduced charge of normal powder behind a light bullet will result in inconsistent ignition and lots of unburnt powder in the bore both of which do nothing for accuracy.
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