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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
High Velocity Throat Erosion
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<blockquote data-quote="elkaholic" data-source="post: 2584433" data-attributes="member: 13833"><p>I think you are correct in your thought process in general. when it comes to velocity. There are a lot of other factors that affect barrel (throat) wear obviously, but I don't think that velocity, in and of itself, is much of a factor. If you think about it, the velocity of a bullet at say 1/4" in front of the chamber isn't going to vary at the same ratio as velocity at the muzzle. i.e., acceleration takes time! I believe that one of the overlooked things affecting barrel life (and velocity for that matter) is WHERE is the bullet in the barrel when peak pressure occurs? I say this because elapsed time under pressure has to be a factor in moving metal that has been heated and under pressure.</p><p>This is a little ofF topic, but to make a point, that is why I argue that equal CHAMBER pressure does not equal the same velocity at the muzzle.</p><p>That is why case design affects all these things as well as changing a powder to a different burn rate.</p><p>All this happens in milliseconds and it would take someone a LOT smarter than me to explain it, but I base it on a lot of results Ive seen in my tinkering with case design.</p><p>The abrasiveness of certain unburned powders have to be a factor in eroding throats as well, by scrubbing the heated metal thats under pressure.</p></blockquote><p></p>
[QUOTE="elkaholic, post: 2584433, member: 13833"] I think you are correct in your thought process in general. when it comes to velocity. There are a lot of other factors that affect barrel (throat) wear obviously, but I don't think that velocity, in and of itself, is much of a factor. If you think about it, the velocity of a bullet at say 1/4" in front of the chamber isn't going to vary at the same ratio as velocity at the muzzle. i.e., acceleration takes time! I believe that one of the overlooked things affecting barrel life (and velocity for that matter) is WHERE is the bullet in the barrel when peak pressure occurs? I say this because elapsed time under pressure has to be a factor in moving metal that has been heated and under pressure. This is a little ofF topic, but to make a point, that is why I argue that equal CHAMBER pressure does not equal the same velocity at the muzzle. That is why case design affects all these things as well as changing a powder to a different burn rate. All this happens in milliseconds and it would take someone a LOT smarter than me to explain it, but I base it on a lot of results Ive seen in my tinkering with case design. The abrasiveness of certain unburned powders have to be a factor in eroding throats as well, by scrubbing the heated metal thats under pressure. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
High Velocity Throat Erosion
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