02-09-2015, 08:15 PM
It assumes that there are tooling marks and other rough spots that need to be smoothed to reduced long term copper and powder fouling. This is why hand lapping and machine lapping were introduced. Todays barrels really don't need that much break in, and most of us use little or none and get great results.
You seek escape from pain. We seek the achievement of happiness. You exist for the sake of avoiding punishment. We exist for the sake of earning rewards. Threats will not make us function; fear is not our incentive. It is not death that we wish to avoid, but life that we wish to live. - John Galt