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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
case weights vs volumes
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<blockquote data-quote="Deleted member 46119" data-source="post: 1295170"><p>I'm with @Mikecr that H2O or "ball powder" volume measurement is only and "indicator". How the brass is sized and how it expands in the chamber are very important as well.</p><p></p><p>There is one important thing to remember through this. Mass = Volume. A certain weight of brass (mass) is going to have a certain volume. Physics is physics and you can't argue with it. A chamber is going to have a volume. Subtract the volume of the brass from the volume of the chamber and you get a measurement that is useless. Well not really. It is the amount of room for the pressure to expand into. Most of this volume is inside the case and the case expands during the firing process to use this space.</p><p></p><p>We refer to "fire formed" cases a lot. In fire formed brass, the mass of the brass has been expanded like a balloon to match the inside of the chamber. This is not a perfect thing and that's why two pieces of brass with the same weight/mass can measure different volumes. </p><p></p><p>So regardless, weighing brass and measuring H2O are only "indicators". </p><p></p><p>The are useful indicators for many. Me included. </p><p></p><p>If all your brass is very close in weight, and all your brass is very closely formed to the chamber, it reduces variations. Add consistent annealing. Consistent primers. Consistent neck gripping and release pressure. Consistent bullet shape, weight and seating.</p><p></p><p>You up your consistency. That is all it does. Increasing consistency is what it's about for accuracy. </p><p></p><p>Clear as mud right.</p></blockquote><p></p>
[QUOTE="Deleted member 46119, post: 1295170"] I'm with @Mikecr that H2O or "ball powder" volume measurement is only and "indicator". How the brass is sized and how it expands in the chamber are very important as well. There is one important thing to remember through this. Mass = Volume. A certain weight of brass (mass) is going to have a certain volume. Physics is physics and you can't argue with it. A chamber is going to have a volume. Subtract the volume of the brass from the volume of the chamber and you get a measurement that is useless. Well not really. It is the amount of room for the pressure to expand into. Most of this volume is inside the case and the case expands during the firing process to use this space. We refer to "fire formed" cases a lot. In fire formed brass, the mass of the brass has been expanded like a balloon to match the inside of the chamber. This is not a perfect thing and that's why two pieces of brass with the same weight/mass can measure different volumes. So regardless, weighing brass and measuring H2O are only "indicators". The are useful indicators for many. Me included. If all your brass is very close in weight, and all your brass is very closely formed to the chamber, it reduces variations. Add consistent annealing. Consistent primers. Consistent neck gripping and release pressure. Consistent bullet shape, weight and seating. You up your consistency. That is all it does. Increasing consistency is what it's about for accuracy. Clear as mud right. [/QUOTE]
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Rifles, Bullets, Barrels & Ballistics
case weights vs volumes
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