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Let's look at this from another angle. Shoot your 3 shot group but don't clean the barrel. let cool as normal and shoot another 3 rounds. Some rifles shoot better with a fouled barrel. My custom .35 Whelen will shoot abut a 1.5" three shot group from a totally clean barrel. After cooling, the next and following groups will run from .50" to .75" as long as I do my part. Clean the barrel and groups open up again.
FWIW, I do not believe in that barrel break in BS. The late barrel maker gale McMillan would void the warranty on his barrels if the shooter did a break in process. He felt that all breaking in did was make a barrel wear out a little sooner. He felt that normal shooting would take care of any breaking in a barrel might need. I have five rifles with custom barrel. None have gone though any special breaking in and four of the five are sub-MOA and the one that is not has olny had maybe 40 rounds through it. It's a .308 BTW. Right now it's about a 1.15" shooter. I expect that will shrink down some.
Paul B.
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