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Rifles, Reloading, Optics, Equipment
Reloading
RCBS Chargemaster accuracy test
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<blockquote data-quote="paphil" data-source="post: 504593" data-attributes="member: 17745"><p>I have the RCBS loadmaster and like it alot. That said, it does throw an ocasional heavy charge due to extra powder falling on that last little turn of the trickler. coarse powders are worse. I don't think the problem is the charges that register high or low, my concern would be the charges that show the correct weight and actually weigh a different weight. I am not too concerned with .1 or .2 grains. Most of my hunting loads are at the point of "diminishing returns" where you don't gain much velocity with extra powder. The .1 and .2 grain differences will have a larger effect on smaller loads because they represent a larger total percentage of the charge. A 17 Remington with a 20 g bullet takes 23.6 g of varget to get 4000 fps. It takes 24.2 to get 4100 fps. .6 grains = 100fps so each .1 grains = 16.6 fps higher or lower velocity. That is an extreme spread of 33 fps caused by .1 variation in powder! Now look at a .338 Lapua Mag that is shooting a 200 g bullet at 2900 fps with 96.5 g of H1000. To get 3000 fps we need 99.2 g. This is 2.7 g for 100 fps. which is 3.7 fps for .1 grain. This totals 7.4 fps extreme spread. </p><p> The smaller the charge the more critical the error. I can live with 7.4 fps spread on big guns but 34 fps might be too much on smaller guns.</p></blockquote><p></p>
[QUOTE="paphil, post: 504593, member: 17745"] I have the RCBS loadmaster and like it alot. That said, it does throw an ocasional heavy charge due to extra powder falling on that last little turn of the trickler. coarse powders are worse. I don't think the problem is the charges that register high or low, my concern would be the charges that show the correct weight and actually weigh a different weight. I am not too concerned with .1 or .2 grains. Most of my hunting loads are at the point of "diminishing returns" where you don't gain much velocity with extra powder. The .1 and .2 grain differences will have a larger effect on smaller loads because they represent a larger total percentage of the charge. A 17 Remington with a 20 g bullet takes 23.6 g of varget to get 4000 fps. It takes 24.2 to get 4100 fps. .6 grains = 100fps so each .1 grains = 16.6 fps higher or lower velocity. That is an extreme spread of 33 fps caused by .1 variation in powder! Now look at a .338 Lapua Mag that is shooting a 200 g bullet at 2900 fps with 96.5 g of H1000. To get 3000 fps we need 99.2 g. This is 2.7 g for 100 fps. which is 3.7 fps for .1 grain. This totals 7.4 fps extreme spread. The smaller the charge the more critical the error. I can live with 7.4 fps spread on big guns but 34 fps might be too much on smaller guns. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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RCBS Chargemaster accuracy test
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