http://spacecoastbullets.com/products.htm
http://www.meisterbullets.com/asccus...22&navParent=0
http://www.thebulletbarn.com/pricelist.html
6gr of HS-6 Where did you come up with that ? I find that faster powders work better in straight blow back actions, Tight Group comes to mind.
And yes the trimmed 9mm Luger case will have less volume than a 9x18 so there should be a charge reduction.