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Rifles, Reloading, Optics, Equipment
Reloading
I guess you really should weigh your brass
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<blockquote data-quote="ImBillT" data-source="post: 2199767" data-attributes="member: 117715"><p>Your chamber has a fixed volume. Fill it with 160gr of brass(in any shape) and it's volume is reduced. The very slight differences in density of different batches of cartridge brass is minuscule. For the purpose of this, the chamber ends as the base of the bullet, so the neck beyond that needs to be similar on all the cases being weighed. You'll get good results if you have them all trimmed to the same length before weighing. You'll get better results if the necks are all turned to the same thickness.</p><p></p><p>There is no reason to attempt to directly measure volume. It's time consuming and prone to error from air bubbles and variance in menisci. An unfired case will have less volume than a fired case, but it expands to fill the chamber so easily that it has very little effect on pressure...only on how much powder you can fit in the case.</p><p></p><p>Weight sorting brass IS measuring volume. It's measuring volume quickly, and accurately, and it's better than filling your cases with water.</p></blockquote><p></p>
[QUOTE="ImBillT, post: 2199767, member: 117715"] Your chamber has a fixed volume. Fill it with 160gr of brass(in any shape) and it’s volume is reduced. The very slight differences in density of different batches of cartridge brass is minuscule. For the purpose of this, the chamber ends as the base of the bullet, so the neck beyond that needs to be similar on all the cases being weighed. You’ll get good results if you have them all trimmed to the same length before weighing. You’ll get better results if the necks are all turned to the same thickness. There is no reason to attempt to directly measure volume. It’s time consuming and prone to error from air bubbles and variance in menisci. An unfired case will have less volume than a fired case, but it expands to fill the chamber so easily that it has very little effect on pressure...only on how much powder you can fit in the case. Weight sorting brass IS measuring volume. It’s measuring volume quickly, and accurately, and it’s better than filling your cases with water. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
I guess you really should weigh your brass
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