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The Range
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Case comparison
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<blockquote data-quote="Jcann" data-source="post: 2960728" data-attributes="member: 33119"><p>I'm confused, are you wanting to compare the muzzle velocity of your reloads to store bought Blackhills 178gr loaded ammo? Or, you have once fired/new? Blackhills brass, but before you reload it, you want to know case volume as compared to Federal brass (to determine possible equality in muzzle velocity between the two).</p><p></p><p>I feel you're asking the impossible solely based on the H2O volume of the two cases. Bullet weight differences and bullet bearing surface differences can also add variances to your equation not to mention neck tension. Granted, these would probably be slight differences in velocity.</p><p></p><p>If I understand you correctly, you are wanting to know if both cases are loaded identical will they shoot within one another's ES/SD. The only way to know for sure is to run them through a chronograph.</p><p></p><p>BTW, The only way to get an accurate case volume measurement is with liquid. Think of putting marbles in a jar then fill it with water. If it holds water the marbles weren't a good media to measure volume. It's the same with ball powder, there will always be voids between the individual pieces of powder.</p></blockquote><p></p>
[QUOTE="Jcann, post: 2960728, member: 33119"] I'm confused, are you wanting to compare the muzzle velocity of your reloads to store bought Blackhills 178gr loaded ammo? Or, you have once fired/new? Blackhills brass, but before you reload it, you want to know case volume as compared to Federal brass (to determine possible equality in muzzle velocity between the two). I feel you're asking the impossible solely based on the H2O volume of the two cases. Bullet weight differences and bullet bearing surface differences can also add variances to your equation not to mention neck tension. Granted, these would probably be slight differences in velocity. If I understand you correctly, you are wanting to know if both cases are loaded identical will they shoot within one another's ES/SD. The only way to know for sure is to run them through a chronograph. BTW, The only way to get an accurate case volume measurement is with liquid. Think of putting marbles in a jar then fill it with water. If it holds water the marbles weren't a good media to measure volume. It's the same with ball powder, there will always be voids between the individual pieces of powder. [/QUOTE]
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