Theoretically, if you have been loading ammo at near maximum velocities but want to load lower velocity ammo, you should use a faster burning powder at higher pressure rather than lowering the charge of the slower burning powder, right? Lowering the charge of the slower powder will result in lower pressure and more soot and unburnt powder? I'm working with 10mm Auto handloads. I've been loading heavy hunting loads. Now I want to load some lower velocity self-defense type loads to avoid over-penetration. So, I figure I should change to a faster burning powder that will burn cleaner at a lower velocity. Am I on the right track?