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Buildup of Copper
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<blockquote data-quote="Hugnot" data-source="post: 2562224" data-attributes="member: 115658"><p>Sounds like a rough barrel in need of lapping. I have seen a few of thses that gave up accuracy quickly, like after 10-15 rounds. A solvent containing Ethanolamine will disolve copper. An indication of ethanolamine reaction with copper may be seen by green-blue stains on patches that have been soaked with ethanolamine with various brass jags or other items contacting the soaked patches. Black crud of unspecified origin will also be attacked. Motor oil (of the detergent type) is another surfacant and applied with a brush. is useful for floating away crud including loose copper.</p><p></p><p>Ethanolamine will not corrode or rust barrel steel. Corrosion resistance of stainless is due to the continual formation of protective barrier of chrome oxide.</p><p></p><p>Progressive copper fouling will really adversely affect accuracy. Imaginine shooting the last 20 at 600 yards for score with a rough barrel that has been subjected to 30 or more previous rounds. Bullets, primers, & powder are pricy.</p><p></p><p>My sugggestion is to lap the barrel. Use a nylon or bronze brush, dip the brush in vsalve grinsing compund and work it thru the barrel. Push the brush completely thru the barrel before reversing the stroke. Load the brush with vslve grinding compound every 20 stokes for a total of 100. Upon completion a re=crowning the muzzle would be a good idea.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2562224, member: 115658"] Sounds like a rough barrel in need of lapping. I have seen a few of thses that gave up accuracy quickly, like after 10-15 rounds. A solvent containing Ethanolamine will disolve copper. An indication of ethanolamine reaction with copper may be seen by green-blue stains on patches that have been soaked with ethanolamine with various brass jags or other items contacting the soaked patches. Black crud of unspecified origin will also be attacked. Motor oil (of the detergent type) is another surfacant and applied with a brush. is useful for floating away crud including loose copper. Ethanolamine will not corrode or rust barrel steel. Corrosion resistance of stainless is due to the continual formation of protective barrier of chrome oxide. Progressive copper fouling will really adversely affect accuracy. Imaginine shooting the last 20 at 600 yards for score with a rough barrel that has been subjected to 30 or more previous rounds. Bullets, primers, & powder are pricy. My sugggestion is to lap the barrel. Use a nylon or bronze brush, dip the brush in vsalve grinsing compund and work it thru the barrel. Push the brush completely thru the barrel before reversing the stroke. Load the brush with vslve grinding compound every 20 stokes for a total of 100. Upon completion a re=crowning the muzzle would be a good idea. [/QUOTE]
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