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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Break in problems?
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<blockquote data-quote="Chawlston" data-source="post: 174307"><p>You are not looking for bore scope evidence. You are seeking to eliminate any burrs or defects that can pick up copper which cause the bullet rotate in an imbalanced state. </p><p></p><p>Basically the cleaning process is gently eliminating the rough edges. Heck, some guys just take five bronze brushes and stroke each 100 times back and forth. This too works as it smooths out the rough edges.</p><p></p><p>The most recent one I did was a factory 338RUM Sendero and when I was breaking in the barrel, I shot all the shots on the target at 100 yards. The gun started shooting tight groups (at shot 35) when the fouling greatly diminished. I guess more of the bullet was exiting the barrel than being left behind. Anyway we got that factory rifle to shoot sub 3/8" with 225gr Accubonds @ 3100fps and we rarely see any copper at all during the cleaning process.</p><p></p><p>So, in short, it may be a myth or even an evil plot by the gun cleaning supply business to sell more product, but in every centerfire barrel I have ever used and competed with as well as any barrel I tuned for friends, they really started shooting when the barrel quit copper fouling.</p><p></p><p>At 200,000 rpm, it doesn't take much to upset the stability of the bullet by changing it's center of mass when you leave some of it in the barrel.......</p><p></p><p>James</p></blockquote><p></p>
[QUOTE="Chawlston, post: 174307"] You are not looking for bore scope evidence. You are seeking to eliminate any burrs or defects that can pick up copper which cause the bullet rotate in an imbalanced state. Basically the cleaning process is gently eliminating the rough edges. Heck, some guys just take five bronze brushes and stroke each 100 times back and forth. This too works as it smooths out the rough edges. The most recent one I did was a factory 338RUM Sendero and when I was breaking in the barrel, I shot all the shots on the target at 100 yards. The gun started shooting tight groups (at shot 35) when the fouling greatly diminished. I guess more of the bullet was exiting the barrel than being left behind. Anyway we got that factory rifle to shoot sub 3/8" with 225gr Accubonds @ 3100fps and we rarely see any copper at all during the cleaning process. So, in short, it may be a myth or even an evil plot by the gun cleaning supply business to sell more product, but in every centerfire barrel I have ever used and competed with as well as any barrel I tuned for friends, they really started shooting when the barrel quit copper fouling. At 200,000 rpm, it doesn't take much to upset the stability of the bullet by changing it's center of mass when you leave some of it in the barrel....... James [/QUOTE]
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Break in problems?
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