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Rifles, Reloading, Optics, Equipment
Reloading
Same volume of powder, different weight?
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<blockquote data-quote="MagnumManiac" data-source="post: 324796" data-attributes="member: 10755"><p>Mike,</p><p>You have hit the holy grail!</p><p>Measuring your powder by volume is about as consistent as weighing each load due to variances in specific gravity.</p><p></p><p>As you suggest, if you counted the amount of kernels from a weighed set of powder 5 times, I bet the number would be different each time, just as it would if you did the same with a measured set of powders.</p><p></p><p>I can tell you this with absolute confidence.</p><p>The most important aspect of your powder charging is pouring technique, which is the 'packing scheme' used once the powder is in the case.</p><p>If your powder isn't packed the same from shot-shot, it will be more inconsistent than a powder that varies in weight by a few tenths and has a good packing scheme.</p><p>I found a long time ago that 'as dumped' charges are more inconsistent in combustion than a charge that has been poured into the case using the 'swirl charge' method.</p><p>Even though it's slower than just charging each case with the measure, I dump each charge into the scale pan and pour the powder in with a funnel. I hold it an angle to cause the powder to 'swirl', like a tornado, as it falls into the case.</p><p>This allows a much longer time for the kernels to settle and it packs down much tighter in the case without having to resort to vibrating or tapping the case.</p><p>I have demonstrated that a charge that is 'as dumped' fills a case well into the neck can be reduced to below the neck/shoulder juncture with ease using this method.</p><p>Without any other changes to the load, I have had a reduction in ES's of 75fps and SD's back into single digits after this simple change in packing scheme. </p><p>Each charge is still not weighed, but the measure is not altered either, if it happens to be giving me 80.5gr instead of the desired 81gr, I do not alter it to get it!</p><p>Whew!</p><p>Long winded I know, but hope this clears up a few mythical theories out there about weighing every charge.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 324796, member: 10755"] Mike, You have hit the holy grail! Measuring your powder by volume is about as consistent as weighing each load due to variances in specific gravity. As you suggest, if you counted the amount of kernels from a weighed set of powder 5 times, I bet the number would be different each time, just as it would if you did the same with a measured set of powders. I can tell you this with absolute confidence. The most important aspect of your powder charging is pouring technique, which is the 'packing scheme' used once the powder is in the case. If your powder isn't packed the same from shot-shot, it will be more inconsistent than a powder that varies in weight by a few tenths and has a good packing scheme. I found a long time ago that 'as dumped' charges are more inconsistent in combustion than a charge that has been poured into the case using the 'swirl charge' method. Even though it's slower than just charging each case with the measure, I dump each charge into the scale pan and pour the powder in with a funnel. I hold it an angle to cause the powder to 'swirl', like a tornado, as it falls into the case. This allows a much longer time for the kernels to settle and it packs down much tighter in the case without having to resort to vibrating or tapping the case. I have demonstrated that a charge that is 'as dumped' fills a case well into the neck can be reduced to below the neck/shoulder juncture with ease using this method. Without any other changes to the load, I have had a reduction in ES's of 75fps and SD's back into single digits after this simple change in packing scheme. Each charge is still not weighed, but the measure is not altered either, if it happens to be giving me 80.5gr instead of the desired 81gr, I do not alter it to get it! Whew! Long winded I know, but hope this clears up a few mythical theories out there about weighing every charge. gun) [/QUOTE]
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Reloading
Same volume of powder, different weight?
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