I agree with Redhawk1 on this one!
Another issue is SAFETY!
Smokeless powder doesn't leave much of a margin for error!
That is, with Black Powder or Substiture, you can be off as much as 50 grains and still be ok, but with smokeless, if you're off as little as 5 grains, you can end up in the hospital or worse, people looking down at you!