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Rifles, Reloading, Optics, Equipment
Reloading
Weighing Powder - How precise is good enough?
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<blockquote data-quote="Mikecr" data-source="post: 533847" data-attributes="member: 1521"><p>If you can't get consistent readings and accuracy with a Chargemaster(within a couple kernels or better), there is a problem with it, or with it's use.</p><p>I was an early adopter and worked with mine for the first year, comparing every charge weight on an Acculab, which goes another place more accurate. This was a real pain but I stayed objective with it. As a result of this, I was able to see what was going on, tune it's operation, and easily call a bad charge -vs- a keeper.</p><p>Eventually there was no further need for the Acculab, and good riddance to it(very accurate and terrible reloading scale).</p><p>With my CM I can dispense most charges with greater accuracy than CMs spec at. With IMR7828, this is to single kernel. With something like H322, it's 2-3 kernels.</p><p></p><p>I think I've seen drifting issues you're referring to, and they are predictable and easy to manage. If you leave a charge on the scale, it will drift away from that charge over time, as the program constantly tweaks for null. It was designed to do this as part of it's self zeroing function(which works well). RCBS should further develop their program to cease nulling when the measure is outside an obvious window. You should see how much an Acculab re-nulls away.. It actually does have to be re-zero'd for every reading! But then, it is very very accurate.</p><p>Personally, I'd like to turn off ALL nulling, and read the scale like a beam.</p><p>Anyway, you can see that 'fresh' readings are accurate, and dump any charge that is suspect, whether it be an 'old' dispense, or an avalanche kernel fall, to cause overcharge.</p><p></p><p>My early revision of the CM has a program flaw that switches from zero null, to nulling the entered/desired value. This would cause it to always read a charge as perfect regardless of what it actually was. To manage this & see my actual charge weight, I disturb & re-disturb the pan after the beep/wife whine, and see the weight directly settle within 2sec to the desired value. If it don't occur within 2sec, the desired value nulling will then adjust it. </p><p>So knowing this, you get a feel for it quick. If it isn't solid on this, ho-hums around it, I dump that charge & re-dispense. In other words, I pay attention to it just as I would manually trickling.</p><p></p><p>You have hysteresis with beam scales that also bring you to disturbing the measure/re-reading to gain confidence and accuracy in your readings. Again, it has to be pay'd attention to.</p><p>There are good programming settings & DIY mods out there for the Chargemaster. They are worth it. I've provided an externally adjustable trickle speed to mine for tuning with different powders, and installed a straw in the tube.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 533847, member: 1521"] If you can't get consistent readings and accuracy with a Chargemaster(within a couple kernels or better), there is a problem with it, or with it's use. I was an early adopter and worked with mine for the first year, comparing every charge weight on an Acculab, which goes another place more accurate. This was a real pain but I stayed objective with it. As a result of this, I was able to see what was going on, tune it's operation, and easily call a bad charge -vs- a keeper. Eventually there was no further need for the Acculab, and good riddance to it(very accurate and terrible reloading scale). With my CM I can dispense most charges with greater accuracy than CMs spec at. With IMR7828, this is to single kernel. With something like H322, it's 2-3 kernels. I think I've seen drifting issues you're referring to, and they are predictable and easy to manage. If you leave a charge on the scale, it will drift away from that charge over time, as the program constantly tweaks for null. It was designed to do this as part of it's self zeroing function(which works well). RCBS should further develop their program to cease nulling when the measure is outside an obvious window. You should see how much an Acculab re-nulls away.. It actually does have to be re-zero'd for every reading! But then, it is very very accurate. Personally, I'd like to turn off ALL nulling, and read the scale like a beam. Anyway, you can see that 'fresh' readings are accurate, and dump any charge that is suspect, whether it be an 'old' dispense, or an avalanche kernel fall, to cause overcharge. My early revision of the CM has a program flaw that switches from zero null, to nulling the entered/desired value. This would cause it to always read a charge as perfect regardless of what it actually was. To manage this & see my actual charge weight, I disturb & re-disturb the pan after the beep/wife whine, and see the weight directly settle within 2sec to the desired value. If it don't occur within 2sec, the desired value nulling will then adjust it. So knowing this, you get a feel for it quick. If it isn't solid on this, ho-hums around it, I dump that charge & re-dispense. In other words, I pay attention to it just as I would manually trickling. You have hysteresis with beam scales that also bring you to disturbing the measure/re-reading to gain confidence and accuracy in your readings. Again, it has to be pay'd attention to. There are good programming settings & DIY mods out there for the Chargemaster. They are worth it. I've provided an externally adjustable trickle speed to mine for tuning with different powders, and installed a straw in the tube. [/QUOTE]
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Weighing Powder - How precise is good enough?
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