I run a mop to get all the powder out of the bore and a little clp until accuracy begins to degrade. On almost all of my rifles they seem to shoot better with some copper fouling in the bore. I believe that the copper fills in the imperfections of the rifling.
The only two rifles I have ever needed to cleen the copper out of it was not until I had fired several hundred rounds.
I think that the quality of the bore makes a very big difference on how fouling effects accuracy.
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