i know, i know, savage don't even offer a rifle in 9mm, so what am i doing asking this here.... because i like you guys, an know you'll be kind to me.

i am gonna be reloading for a SMG and they are extremely unforgiving of double charges and squibs.

is there a powder that will fill the case to near full in one charge, so that an extremely light charge would be plainly noticable or a double charge would make a mess, and still work the bolt properly, i know the cowboy action stuff is out there but is it for sami auto's? i used tightgroup last time i did handgun loads and i could probably get a triple charge in the case w/ that stuff...