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Rifles, Reloading, Optics, Equipment
Reloading
Charge weight vs volume, in filled cases - mind blowing discovery?
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<blockquote data-quote="Max Heat" data-source="post: 922401" data-attributes="member: 43153"><p>But the thrower's set volume, which does not vary (once set), is intended to represent a set weight. What I'm talking about is using each case's own volume to dictate exact amount of powder, who's weight is allowed to vary [slightly] from case to case, maintaining a consistant fill level of the case. </p><p></p><p>At that time I saw those amazingly close chrono #s, I didn't have quite as much equipment to work with as I have now. I've been loading my RUM rounds individually by weight, searching for the optimum powder type & charge weight. But now that I've settled in on the powder, and almost narrowed down to the exact "base" charge weight that I want to go with (right around 102 or 103gr, which IS into the neck of the case), I'm going to have the powder measure attached to my progressive press to drop a charge into the cases. Then make final tweaks to each charge, according to readings from my "powder cop" die, before sending the cases on to the seating station, and out. </p><p></p><p>The powder cop does actually have a rod that "drops" into the case to allow visual verification of the charge level, before it moves to the seater. If the charge level is up into the case neck, the rod measurement will be roughly 5 times more accurate than a similar measurement would be if the charge level is below the shoulder. The rod uses an o-ring for reading the charge level. I think more accurate readings could be taken [and therefore finer adjustments possible] if a small, very thin washer [of appropriate size to fit the rod] is placed on top of the o-ring, with something of equal thinness that it can be lined up with.</p></blockquote><p></p>
[QUOTE="Max Heat, post: 922401, member: 43153"] But the thrower's set volume, which does not vary (once set), is intended to represent a set weight. What I'm talking about is using each case's own volume to dictate exact amount of powder, who's weight is allowed to vary [slightly] from case to case, maintaining a consistant fill level of the case. At that time I saw those amazingly close chrono #s, I didn't have quite as much equipment to work with as I have now. I've been loading my RUM rounds individually by weight, searching for the optimum powder type & charge weight. But now that I've settled in on the powder, and almost narrowed down to the exact "base" charge weight that I want to go with (right around 102 or 103gr, which IS into the neck of the case), I'm going to have the powder measure attached to my progressive press to drop a charge into the cases. Then make final tweaks to each charge, according to readings from my "powder cop" die, before sending the cases on to the seating station, and out. The powder cop does actually have a rod that "drops" into the case to allow visual verification of the charge level, before it moves to the seater. If the charge level is up into the case neck, the rod measurement will be roughly 5 times more accurate than a similar measurement would be if the charge level is below the shoulder. The rod uses an o-ring for reading the charge level. I think more accurate readings could be taken [and therefore finer adjustments possible] if a small, very thin washer [of appropriate size to fit the rod] is placed on top of the o-ring, with something of equal thinness that it can be lined up with. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Charge weight vs volume, in filled cases - mind blowing discovery?
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