The question about barrel break in is a loaded question. There are as many procedures as there are shooters in this world. Some shoot one and clean for 10 rounds, then shoot 3 rounds and clean, then 5 rounds and clean etc... or some variation of this. A friend of mine will take scalding hot water and pour it down a brand new barrel to clean all the machining residue and filings out of the barrel, dry it real good and oil it. That' his break in procedure.
The other end of the spectrum is a pretty well respected guy in the "biz" by the name of Gale McMillan. He seems to think that barrel break is hogwash. Rather than try to paraphrase what he said here is a link to 6mmbr.com where there is a collection of comments made by McMillan.
http://www.6mmbr.com/gailmcmbreakin.html
To each his own but from personal experience I can't tell the difference between when I break in a barrel and when I don't. Sometimes you get a bad barrel but most of the time they are pretty good.
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