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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Match Grade Barrell break in procedures
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<blockquote data-quote="el matador" data-source="post: 1020528" data-attributes="member: 12193"><p>Nobody seems to know exactly what goes on inside a new barrel. I've heard plenty of theories on how break in works (or doesn't work), but only two of these theories really make sense to me.</p><p></p><p>1: Match grade barrels are lapped/polished before you ever shoot them. So using bullets to polish the bore is nonsense. Any "pores" in the steel will fill with copper when you shoot and be cleaned out when you clean. So break in does nothing for the actual bore surface.</p><p></p><p>2: During machining of the throat there is a very small burr created on each of the lands. When a bullet is fired, the burr shaves off some copper which is vaporized by the heat and pressure of the burning powder. It's this copper (vapor/droplets) that condenses in the bore and causes excess fouling. After a number of shots, maybe 5-15 or so, the burr is worn away and copper fouling is greatly reduced.</p><p></p><p>They are just theories but they seem to match what I hear from some very experienced shooters: Break in is pretty much done within 10 shots from a quality barrel. Also, lower quality barrels take longer to break in because throating reamers are not as sharp and create a larger burr on the lands.</p></blockquote><p></p>
[QUOTE="el matador, post: 1020528, member: 12193"] Nobody seems to know exactly what goes on inside a new barrel. I've heard plenty of theories on how break in works (or doesn't work), but only two of these theories really make sense to me. 1: Match grade barrels are lapped/polished before you ever shoot them. So using bullets to polish the bore is nonsense. Any "pores" in the steel will fill with copper when you shoot and be cleaned out when you clean. So break in does nothing for the actual bore surface. 2: During machining of the throat there is a very small burr created on each of the lands. When a bullet is fired, the burr shaves off some copper which is vaporized by the heat and pressure of the burning powder. It's this copper (vapor/droplets) that condenses in the bore and causes excess fouling. After a number of shots, maybe 5-15 or so, the burr is worn away and copper fouling is greatly reduced. They are just theories but they seem to match what I hear from some very experienced shooters: Break in is pretty much done within 10 shots from a quality barrel. Also, lower quality barrels take longer to break in because throating reamers are not as sharp and create a larger burr on the lands. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Match Grade Barrell break in procedures
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