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Long Range Hunting & Shooting
Carbon wrapped barrel ?
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<blockquote data-quote="jcoop" data-source="post: 662523" data-attributes="member: 13125"><p>I work in carbon fiber as a product designer and have to agree with most of what fiftydriver has said.</p><p> The only thing I usually see as a misconception is regarding the type of fibers that are used. There are two diferent kinds of fibers used - Pitch and Pan. Abs barrels use pitch fibers which are much more thermally conductive and cool down much faster than steel. Other manufacturs such as Magnum Research use pan fibers which have a much higher stiffness to weight ratio. In the testing I have done with pan fibers a solid 1/2" rod of pan fibers (standard modulas) is still stiffer than a 1/2" steel rod. However if you do that same test with pitch fibers (what abs uses) you will get the results that Kirby discribed. However pan fibers are an insulator so you do not get the cooling properties you do with pitch. But due to the stiffness you also do not get a point of impact change due to the increased stiffness.</p><p>Pitch fibers expand and contract with timp changes and pan fibers are basically innert and do not change with different temps.</p><p> Also with abs barrels the fibers are wrapped around the barrel. With MAgnum Research barrels the fibers run the length of the barrel which adds to stiffnes considerablly.</p><p></p><p>Bacicaly what I'm saying is that all carbon fiber barrels are not the same in regards to stiffness and heat disapation.</p><p></p><p> So for me in a long range hunting rifle I have chosen to use Magnum Research barrels on a few rifles as barrel life is not my big concern. I know many people that use ABS barrels and are very happy with them but from a design side for my hunting application I prefer magnums barrels.</p></blockquote><p></p>
[QUOTE="jcoop, post: 662523, member: 13125"] I work in carbon fiber as a product designer and have to agree with most of what fiftydriver has said. The only thing I usually see as a misconception is regarding the type of fibers that are used. There are two diferent kinds of fibers used - Pitch and Pan. Abs barrels use pitch fibers which are much more thermally conductive and cool down much faster than steel. Other manufacturs such as Magnum Research use pan fibers which have a much higher stiffness to weight ratio. In the testing I have done with pan fibers a solid 1/2" rod of pan fibers (standard modulas) is still stiffer than a 1/2" steel rod. However if you do that same test with pitch fibers (what abs uses) you will get the results that Kirby discribed. However pan fibers are an insulator so you do not get the cooling properties you do with pitch. But due to the stiffness you also do not get a point of impact change due to the increased stiffness. Pitch fibers expand and contract with timp changes and pan fibers are basically innert and do not change with different temps. Also with abs barrels the fibers are wrapped around the barrel. With MAgnum Research barrels the fibers run the length of the barrel which adds to stiffnes considerablly. Bacicaly what I'm saying is that all carbon fiber barrels are not the same in regards to stiffness and heat disapation. So for me in a long range hunting rifle I have chosen to use Magnum Research barrels on a few rifles as barrel life is not my big concern. I know many people that use ABS barrels and are very happy with them but from a design side for my hunting application I prefer magnums barrels. [/QUOTE]
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