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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
copper after cleaning
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<blockquote data-quote="tim_w" data-source="post: 1457911" data-attributes="member: 11132"><p>Steve,</p><p></p><p>Do you think the surface area of bearing surface in your bullet design is less than typical design such as the lapua's mentioned? I have seen less fouling like you have also when I have used GS bullets but as they have very small area with the engraving bands it stands to reason. </p><p></p><p>When considering effects of hardness you would think the harder the metal the less fouling but Lapua and most cup and core bullets use gilding metal i.e copper alloy with around 5% zinc and harder</p><p></p><p>After that I would think lathe turned pure copper bullets would be the softest as there is no work hardening when compared to swaged solid copper bullet thus harder than the turned bullet.</p><p></p><p>But as people are seeing less fouling with a soft pure copper bullet I have to think it has to do with the engraving/bearing surface.and/or possibly a design that decreases gas cutting spraying the bore with micro copper sputter. I recall early predecessor of the Barnes TSX the x-bullet had serious copper fouling effects because of the long bearing surface and had the pressure to go with it. When they went to the driving bands to address the issue it was around a 50% reduction which it seems with time has reduced further by changes in bearing surface vs neck length ratio.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1457911, member: 11132"] Steve, Do you think the surface area of bearing surface in your bullet design is less than typical design such as the lapua's mentioned? I have seen less fouling like you have also when I have used GS bullets but as they have very small area with the engraving bands it stands to reason. When considering effects of hardness you would think the harder the metal the less fouling but Lapua and most cup and core bullets use gilding metal i.e copper alloy with around 5% zinc and harder After that I would think lathe turned pure copper bullets would be the softest as there is no work hardening when compared to swaged solid copper bullet thus harder than the turned bullet. But as people are seeing less fouling with a soft pure copper bullet I have to think it has to do with the engraving/bearing surface.and/or possibly a design that decreases gas cutting spraying the bore with micro copper sputter. I recall early predecessor of the Barnes TSX the x-bullet had serious copper fouling effects because of the long bearing surface and had the pressure to go with it. When they went to the driving bands to address the issue it was around a 50% reduction which it seems with time has reduced further by changes in bearing surface vs neck length ratio. [/QUOTE]
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copper after cleaning
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