Had to go up to 10g on my guns for SW MP. Still lots of room in the case. I tried HS6 and it was FILTHY and the impact hit me weird in my hand. Tried all different loads from 168-173PF and it was just odd. SW MP felt really nice with a nice predictable impulse in your hand. Dot tracked much less side to side versus HS6. Also, the gun got very very hot quickly with HS6 and I needed two guns to practice with.
Powder in a 9mm case was not even close to full. Plenty of room compared to 3N38, etc.
Around here in Southeast MP is pretty easy to get.