There is a point of copper equilibrium where the buildup is minimal (shooting it out at almost the same rate it is being added) where accuracy tends to stay very consistent for a good many rounds.
You clean out all the copper and then have to start over.
Of course there are others with precision rigs that like to clean after every shot...
Different strokes for different folks and all.
I personally fall in the camp that lets the copper build a bit and watch for the accuracy taking a fast turn south before cleaning (and starting over).
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