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The Range
Ammo & Reloading
Why does muzzle velocity increase with barrel heat
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<blockquote data-quote="dennishoddy" data-source="post: 2189517" data-attributes="member: 5412"><p>Ok, The gas bottle case is relevant. I deal with that every day when I have to measure the test gas in our CEM system. </p><p>It has nothing to do with what happens in the chamber/barrel of a gun.</p><p>Barrel heat is caused by friction, and the temperature of the propellant. </p><p>I would have to equate the "Charles's law </p><p>(also known as the law of volumes) is an <strong>experimental</strong> gas law: as a means to measure the temperature of the gas, but then we have the structure of the steel. Different alloys have different properties. For example: 1018 cold rolled vs Inconel, vs 4140 which lots of gun barrels are made from. Military grade barrels are made from 41V50 milspec vanadium/molybdenum alloy steel.</p><p>Each has their own property's when heat treated, and subjected to sustained fire.</p><p></p><p>As an example at our plant, we have to remove ring gears that weigh around a ton from a shaft. It takes 4 guys with rose bud torches to start from the outside of the gear and work their way into the center. After the outside steel expands, it gives the inside steel room to move out. As they work toward the center, the gear drops from the shaft.</p><p></p><p>As posted before, when a pressed in bearing fails, some of which may have 20 pound rollers, welders run a bead around the inner part of the outer race, and it just drops out on the floor.</p><p></p><p>So, for the record, steel can me made to run either direction depending on where the heat is applied.</p></blockquote><p></p>
[QUOTE="dennishoddy, post: 2189517, member: 5412"] Ok, The gas bottle case is relevant. I deal with that every day when I have to measure the test gas in our CEM system. It has nothing to do with what happens in the chamber/barrel of a gun. Barrel heat is caused by friction, and the temperature of the propellant. I would have to equate the "Charles's law (also known as the law of volumes) is an [B]experimental[/B] gas law: as a means to measure the temperature of the gas, but then we have the structure of the steel. Different alloys have different properties. For example: 1018 cold rolled vs Inconel, vs 4140 which lots of gun barrels are made from. Military grade barrels are made from 41V50 milspec vanadium/molybdenum alloy steel. Each has their own property's when heat treated, and subjected to sustained fire. As an example at our plant, we have to remove ring gears that weigh around a ton from a shaft. It takes 4 guys with rose bud torches to start from the outside of the gear and work their way into the center. After the outside steel expands, it gives the inside steel room to move out. As they work toward the center, the gear drops from the shaft. As posted before, when a pressed in bearing fails, some of which may have 20 pound rollers, welders run a bead around the inner part of the outer race, and it just drops out on the floor. So, for the record, steel can me made to run either direction depending on where the heat is applied. [/QUOTE]
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