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Rifles, Reloading, Optics, Equipment
Reloading
REVERSE TEMP SENSITIVITY????
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<blockquote data-quote="Dean2" data-source="post: 2667581" data-attributes="member: 26077"><p>Without getting into a long and complicated explanation of thermodynamics and the coefficient of thermal expansion for various materials let me provide the simple version. The coefficient is change per degree of temperature, per inch of length or area. While lead and copper have a higher coefficient than Stainless or Chromemoly, in the case we are talking about you have 1 inch of lead versus 24 inches of barrel. This length relationship also applies to the area of both. So simple example, a .308 bullet, sits inside a chamber that is ball park 1.25-1.5 inches in diameter and tapers to about .7 for the muzzle. Still nearly double the diameter of the bullet. Applying Pie x R squared you can easily see the large differences in area. The amount the barrel contracts or expands is exactly the same whether it is a solid piece or as in the case of a rifle hollow. In other words the hole constricts as much as the material. </p><p></p><p>The conclusion that the bullets area will shrink more than the barrels is incorrect due to the very large difference in mass, length and area.</p></blockquote><p></p>
[QUOTE="Dean2, post: 2667581, member: 26077"] Without getting into a long and complicated explanation of thermodynamics and the coefficient of thermal expansion for various materials let me provide the simple version. The coefficient is change per degree of temperature, per inch of length or area. While lead and copper have a higher coefficient than Stainless or Chromemoly, in the case we are talking about you have 1 inch of lead versus 24 inches of barrel. This length relationship also applies to the area of both. So simple example, a .308 bullet, sits inside a chamber that is ball park 1.25-1.5 inches in diameter and tapers to about .7 for the muzzle. Still nearly double the diameter of the bullet. Applying Pie x R squared you can easily see the large differences in area. The amount the barrel contracts or expands is exactly the same whether it is a solid piece or as in the case of a rifle hollow. In other words the hole constricts as much as the material. The conclusion that the bullets area will shrink more than the barrels is incorrect due to the very large difference in mass, length and area. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
REVERSE TEMP SENSITIVITY????
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