You guys were correct, I meant 6 drams and not 6 ounces. Yikes, screwed up my post right out of the starting gate!

Usage is in a modern single shot 12 gauge that typically shoots smokeless slugs for visual and auditory effect.

Would prefer to have no wad or overshot card if at all possible, and I have a star crimper and a roll crimper... But no idea how to get the shell closed without having black powder be exposed to suck up moisture (potentially) or without having to use an overshot card (and don't really want a potential projectile). Thoughts?