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Rifles, Reloading, Optics, Equipment
Reloading
Case weight vs pressure
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<blockquote data-quote="Max Heat" data-source="post: 921658" data-attributes="member: 43153"><p>I'm not sure if I even qualify to post a response in this thread, but you may find this to be VERY interesting.</p><p></p><p>Lets start out by being in agreement that the closer you are to having a 100% filled case, the more efficent, in terms of velocity vs powder charge, the round becomes. From what I have found when working at (or very close to) 100% capacity, a change of say, 1% in the case-filling VOLUME of the charge makes MORE of a difference in velocity than a 1% change in the charge's WEIGHT! I have discovered that when using cases having randomly varying weights, the velocity spread will be considerably tighter if the charged is measured by dropping a marked or scribed rod into down into the case and perfectly matching the height (relative to top of the neck, so case lengths must match) level of the charge in each case, rather than by perfectly matching the weight of each charge. Does this blow your mind? But such measurements are only accurate enough when the case is filled to top of shoulder/bottom of neck minimum. This method appears to effectively negate variations in velocity caused by case weight (and thereby internal volume) differences.</p><p></p><p>Now that I have gone public with my theory, for which I only have a small amount of supporting data at this time, I welcome anyone to try replicating it, and either concur (agree) or digress (disagree) that this is indeed the "case"!</p></blockquote><p></p>
[QUOTE="Max Heat, post: 921658, member: 43153"] I'm not sure if I even qualify to post a response in this thread, but you may find this to be VERY interesting. Lets start out by being in agreement that the closer you are to having a 100% filled case, the more efficent, in terms of velocity vs powder charge, the round becomes. From what I have found when working at (or very close to) 100% capacity, a change of say, 1% in the case-filling VOLUME of the charge makes MORE of a difference in velocity than a 1% change in the charge's WEIGHT! I have discovered that when using cases having randomly varying weights, the velocity spread will be considerably tighter if the charged is measured by dropping a marked or scribed rod into down into the case and perfectly matching the height (relative to top of the neck, so case lengths must match) level of the charge in each case, rather than by perfectly matching the weight of each charge. Does this blow your mind? But such measurements are only accurate enough when the case is filled to top of shoulder/bottom of neck minimum. This method appears to effectively negate variations in velocity caused by case weight (and thereby internal volume) differences. Now that I have gone public with my theory, for which I only have a small amount of supporting data at this time, I welcome anyone to try replicating it, and either concur (agree) or digress (disagree) that this is indeed the "case"! [/QUOTE]
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Case weight vs pressure
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