Personally I wouldn’t recommend trying to undercharge any round. You might wind up with a squib. I’d stick with whatever the Powder manufacturers recommends.
Not related to ammo, I recommend these folks to improve Springfield triggers http://www.powderriverprecision.com/ .
Not trying to undercharge the round. Rather I am looking for insights into the various powders - to see if there is a load and a powder that provides a 100% powder burn for a 3.3 inch barrel, versus the longer barrels of my full size Sigs.
Thanks.