This topic comes up from time to time and invariably somebody will pull up an old McMillan post.And most will ridicule anybody that disagrees.
My idiosyncracy is that I clean my barrels until I get the copper out.It's not necessarily an accuracy enhancement,but my thinking is that anything trapped underneath the copper can cause corrosion.If your barrel is easy to clean,great.If not some repetitive firing and cleaning can help.(all barrels are not McMillan BTW).
Neither I nor anybody else has anything other than opinion about what this does to accuracy.If you set out to prove what you already believe,that is the result you will get.
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