I will do the cleaning before starting with a new box of shells
Make sure you use a dedicated copper solvent. Most solvents do very little for copper. After cleaning, crack a couple "fouling shots" then shoot for groups. Use a good solid rest.
"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not." Thomas Jefferson
"I ask, who are the militia? They consist of now of the whole people, except a few public officers." George Mason