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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 thunder project
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<blockquote data-quote="Fiftydriver" data-source="post: 115383" data-attributes="member: 10"><p>GG,</p><p></p><p>Interesting read, Glad to hear she is shooting for you. I have very limited experience with wrapped barrels as far as actually owning them and testing them out. Built rifles with several but not owned any.</p><p></p><p>I have heard two different theories behind a carbon wrapped barrel and how they handle bore heat.</p><p></p><p>One is the theory you are reporting on that the carbon wrapping really pulls the heat out of the steel bore quickly which can be explained by the lower chamber end temps compared to the warmer muzzle temps.</p><p></p><p>On the other side of the coin, I have heard many say that carbon wrapping insulates heat and prevents it from being released from steel. This is with many engine and exhaust componants and it is used to protect other engine parts from heat by preventing it from being released into the engine bay.</p><p></p><p>This theory would also be supported by what you are finding with the chamber end being cooler and the muzzle end being warmer.</p><p></p><p>I would live to see and internal bore temp test done to see what the internal temps of the actual steel bore was compared to a conventional steel barrel vs. a carbon wrapped barrels. That would put an end to one or the other of the theories if you could get accurate internal temp readings of the barrel steel.</p><p></p><p>Another interesting item somewhat related to barrel temp. Over the 4th when I was up playing with Richard Graves and his 277 Allen Mag which is one of my Xtreme Sporter V-Block rifles. We noticed right off that the chamber end stayed MUCH cooler then the rest of the barrel. </p><p></p><p>We started paying closer attention to this and where the barrel was sitting in the aluminum V-Block, about the first 7" of barrel, it was noticably cooler then even just an inch ahead of the V-Block.</p><p></p><p>Seems with the lighter barrel contours using this system it actually acts like a heat sink to pull heat out of the barrel steel. With the heavy V-Blocks the barrels are so massive you really can not tell this but the Sporter V-Block was very obvious.</p><p></p><p>Anyway, you need to figure out a way to measure the internal bore temp and then do a full report for us. Then you can send your rifle back up here to get rebarreled!!! </p><p></p><p>You are a shooting fool my friend!! Good report though.</p><p></p><p>I do not think you will have much problem smacking an elk at 1K. All this talk about the 225 gr Accubond is making me think I need to test some in my light weight 338 AM when I get it finished. How do you think they would survive +3800 fps? /ubbthreads/images/graemlins/grin.gif</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 115383, member: 10"] GG, Interesting read, Glad to hear she is shooting for you. I have very limited experience with wrapped barrels as far as actually owning them and testing them out. Built rifles with several but not owned any. I have heard two different theories behind a carbon wrapped barrel and how they handle bore heat. One is the theory you are reporting on that the carbon wrapping really pulls the heat out of the steel bore quickly which can be explained by the lower chamber end temps compared to the warmer muzzle temps. On the other side of the coin, I have heard many say that carbon wrapping insulates heat and prevents it from being released from steel. This is with many engine and exhaust componants and it is used to protect other engine parts from heat by preventing it from being released into the engine bay. This theory would also be supported by what you are finding with the chamber end being cooler and the muzzle end being warmer. I would live to see and internal bore temp test done to see what the internal temps of the actual steel bore was compared to a conventional steel barrel vs. a carbon wrapped barrels. That would put an end to one or the other of the theories if you could get accurate internal temp readings of the barrel steel. Another interesting item somewhat related to barrel temp. Over the 4th when I was up playing with Richard Graves and his 277 Allen Mag which is one of my Xtreme Sporter V-Block rifles. We noticed right off that the chamber end stayed MUCH cooler then the rest of the barrel. We started paying closer attention to this and where the barrel was sitting in the aluminum V-Block, about the first 7" of barrel, it was noticably cooler then even just an inch ahead of the V-Block. Seems with the lighter barrel contours using this system it actually acts like a heat sink to pull heat out of the barrel steel. With the heavy V-Blocks the barrels are so massive you really can not tell this but the Sporter V-Block was very obvious. Anyway, you need to figure out a way to measure the internal bore temp and then do a full report for us. Then you can send your rifle back up here to get rebarreled!!! You are a shooting fool my friend!! Good report though. I do not think you will have much problem smacking an elk at 1K. All this talk about the 225 gr Accubond is making me think I need to test some in my light weight 338 AM when I get it finished. How do you think they would survive +3800 fps? [img]/ubbthreads/images/graemlins/grin.gif[/img] Good Shooting!! Kirby Allen(50) [/QUOTE]
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