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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
So...Breaking in New Barrel Is a Scam?
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<blockquote data-quote="Topshot" data-source="post: 334207" data-attributes="member: 13285"><p>I have read through this thread and have not seen the reason why I believe that running in a new barrel is a good idea. So here goes.</p><p> </p><p>When a gunsmith cuts the chamber, the reamer is turning at right angles to the barrel rifling. This means that small steel burs will form on the edge and corners of the lands.</p><p> </p><p>Now a barrel might end up with more of a larger bur on one particular land than another, some lands may not have any burs.</p><p> </p><p>So when you first fire the barrel, copper builds up on these burs. The larger the bur the more the build up. You want to remove all this copper so that the powder gas can wear away the burs and leave a nice sharp and even set of lands.</p><p> </p><p>If you leave some copper to build up on one land but not the others then you will obviously get uneven wear on the lands. This is detrimental to long term accuracy.</p><p> </p><p>Avoiding uneven wear of the lands is the main reason to run in a rifle barrel. </p><p> </p><p>After the initial run in period and all the burs have been erroded away from the lands by the powder gases, then you should be right to clean and shoot as normal.</p></blockquote><p></p>
[QUOTE="Topshot, post: 334207, member: 13285"] I have read through this thread and have not seen the reason why I believe that running in a new barrel is a good idea. So here goes. When a gunsmith cuts the chamber, the reamer is turning at right angles to the barrel rifling. This means that small steel burs will form on the edge and corners of the lands. Now a barrel might end up with more of a larger bur on one particular land than another, some lands may not have any burs. So when you first fire the barrel, copper builds up on these burs. The larger the bur the more the build up. You want to remove all this copper so that the powder gas can wear away the burs and leave a nice sharp and even set of lands. If you leave some copper to build up on one land but not the others then you will obviously get uneven wear on the lands. This is detrimental to long term accuracy. Avoiding uneven wear of the lands is the main reason to run in a rifle barrel. After the initial run in period and all the burs have been erroded away from the lands by the powder gases, then you should be right to clean and shoot as normal. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
So...Breaking in New Barrel Is a Scam?
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