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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Factory barrels stringing shots when heated?
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<blockquote data-quote="Deleted member 46119" data-source="post: 1122444"><p>Rick answered very well.</p><p></p><p>I made a barrel "cooler" to draw air through the barrel between shots. It sped up testing time. It's a "Bug Vacuum" with a rubber donut to fit over the end of the barrel. I may "improve" it by rebuilding it to clip on like the patch catchers. Eats batteries pretty fast though.</p><p></p><p>About barrel warping under heat: </p><p>As the barrel heats the metal expands more/less in different places due to "inconsistent density" or "crystalline structure" variations. </p><p></p><p>"Custom" barrels are made with more "consistent" metal. Heat induced expansion warping is reduced. </p><p></p><p>Stress relieving "factory" and "custom" barrels helps.</p><p></p><p>There is also inconsistent heating because the flame/heat from powder ignition is not transferred to the barrel perfectly and because the underside of the barrel has less exposure to air from the stock.</p><p></p><p>On some of my BR rifles like my big barrel block 300 RUM, I have heat sensitive stickers. I have mapped how the barrel changes with temperature changes. </p><p></p><p>For a hunting rifle, I consider it a non-issue even though I still do testing to "understand" where the followup shots will go. </p><p></p><p>For a target rifle, of course it is crucial to understand where the POI will move as the barrel heats up.</p></blockquote><p></p>
[QUOTE="Deleted member 46119, post: 1122444"] Rick answered very well. I made a barrel "cooler" to draw air through the barrel between shots. It sped up testing time. It's a "Bug Vacuum" with a rubber donut to fit over the end of the barrel. I may "improve" it by rebuilding it to clip on like the patch catchers. Eats batteries pretty fast though. About barrel warping under heat: As the barrel heats the metal expands more/less in different places due to "inconsistent density" or "crystalline structure" variations. "Custom" barrels are made with more "consistent" metal. Heat induced expansion warping is reduced. Stress relieving "factory" and "custom" barrels helps. There is also inconsistent heating because the flame/heat from powder ignition is not transferred to the barrel perfectly and because the underside of the barrel has less exposure to air from the stock. On some of my BR rifles like my big barrel block 300 RUM, I have heat sensitive stickers. I have mapped how the barrel changes with temperature changes. For a hunting rifle, I consider it a non-issue even though I still do testing to "understand" where the followup shots will go. For a target rifle, of course it is crucial to understand where the POI will move as the barrel heats up. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Factory barrels stringing shots when heated?
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