Lets go over this again Dave.....

We use the same Renegade
We use the same Renegade barrel manufacturer
We use the same caliber
We use the same twist
We use the same roundball manufacturer.

I use a plain, smooth .015 cotton patch that's very lightly covered with Permatex. I was swabbing after every three shots.No wad involved. I also used 70 gr. 777 FFF. I'm on the verge of switching to real black (either Schuetzen or Swiss) -- won't know which one I like best until prior to hunting season in November. The reason it will take so long is because I want (1) powder for all my MLs.

If I were you, I would end that testing& stick to moosemilk. You have a winner there (1.50" group) ... you can always use that Permatex around the house/garage for cleaning after tools work.

My groups were never that tight - simply because my way of sighting-in is Pickup - aim - elbow-down on the table & rifle barrel atop a sandbag method.Because of that, 2-3" groups are about the best I see with any centerfire or ML.

When I do changeover to blackpowder, I will start with the Permatex patch, but what my Renegade prefers by then is yet-to-be determined. You can retry that test after storing some Permatex patches & letting them dry-out for a month or-so in a Skoal can. Go light with the Permatex... just get the patch covered lightly - no excess.