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Custom Barrel Care at 17X By Jim See
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<blockquote data-quote="Coyboy" data-source="post: 341671" data-attributes="member: 3733"><p>Walt, I cannot say exactly what happens to the bore that allows it to copper foul substantally less after a proper brake in. </p><p></p><p>Some ideas I or others have or have had at one time; </p><p></p><p>Carbon is laid down in the micro finish of the barrel, this sounds kinda wierd but if may explain the coffee collored hue in a used but clean custom barrel.</p><p></p><p>The well repeated idea that the throat tooling marks from the chamber reamer are being smoothed out with the idea that there is a copper wash sent down the bore due to the reamer marks disrupting the copper jacket.</p><p></p><p>If we think about the granular finish left by lapping a barrel on the microscopic level it would consist of thousands of peaks and valleys running parralel with the lands, to reason that copper rubbing over these "peaks" does not burnish or round them off is like saying I can take my rockwell 45 hunting knife and cut thru a copper pipe and not have the blade dull.</p><p></p><p>So with that common sence being applied to a copper jacketed bullet being swaged into the rifling under 50,000 psi. I would conclude that there is some change to the barrel that is in fact what is defined as "Brake-in" </p><p></p><p>I do not know of any Metallurgist who would make the statment you suggested in your post.</p><p>I dought your son in law is using a precision rifle in his duties, if he was that statment would not be made.</p></blockquote><p></p>
[QUOTE="Coyboy, post: 341671, member: 3733"] Walt, I cannot say exactly what happens to the bore that allows it to copper foul substantally less after a proper brake in. Some ideas I or others have or have had at one time; Carbon is laid down in the micro finish of the barrel, this sounds kinda wierd but if may explain the coffee collored hue in a used but clean custom barrel. The well repeated idea that the throat tooling marks from the chamber reamer are being smoothed out with the idea that there is a copper wash sent down the bore due to the reamer marks disrupting the copper jacket. If we think about the granular finish left by lapping a barrel on the microscopic level it would consist of thousands of peaks and valleys running parralel with the lands, to reason that copper rubbing over these "peaks" does not burnish or round them off is like saying I can take my rockwell 45 hunting knife and cut thru a copper pipe and not have the blade dull. So with that common sence being applied to a copper jacketed bullet being swaged into the rifling under 50,000 psi. I would conclude that there is some change to the barrel that is in fact what is defined as "Brake-in" I do not know of any Metallurgist who would make the statment you suggested in your post. I dought your son in law is using a precision rifle in his duties, if he was that statment would not be made. [/QUOTE]
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