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Old June 12, 2013, 10:50 AM   #26
Senior Member
Join Date: January 24, 2013
Location: NC
Posts: 545
The idea behind break-in is to keep bullet jacket in contact with steel on every shot until the barrel is smoothed. A bullet sheds copper and a new barrel picks up copper quickly. The break in procedure requires skill in the cleaning process and removes the copper from the barrel and allows the next bullet to go across steel and do the work of smoothing it. Lapping can work but it can also ruin. The line between good and bad barrels in bench rest is way to thin to use quick methods of smoothing out barrels. The idea is to eventually have a barrel that you can fire 5 rounds with almost zero copper retained.
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