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Rifles, Reloading, Optics, Equipment
Reloading
Lee and RCBS powder scale inaccuracy...
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<blockquote data-quote="Topgun 30-06" data-source="post: 794153" data-attributes="member: 28854"><p>I have no idea how TS23 came up with that explanation of his because, as was stated by MontanaRifleman, it is incorrect, and the example given by MR is spot on. The breaking point on a digital scale is when the weight on the pan is close to the midway point of the minimum graduation that is displayed on the device. Thus, it is just as MR stated in that there shouldn't be more than +/-1/2 that weight that the scale will be off when it is deciding to stay at what it's showing on the display or move to the next figure. That sensitivity test is one that I did in the field during testing of commercial w&m devices as a State W&M Official. In other words, if my target weight is 50 grains of powder and the scale shows it is 50 grains, the actual weight could be 49.5 to 50.5 grains. Depending on the scale sensitivity in use it is probably going to be a little less than that and certainly would not be the large range of error as mentioned by TS23. I would also question the TS23 statement about weighing the paper with and without his name on it on a reloading bench beam scale. That kind of sensitivity can only be seen on a very expensive scale like we had in our Michigan State Metrology Laboratory and not with a device that a person would have available at their home reloading bench. All this being said, I prefer my 505 beam scale because I can see the actual movement in the pointer as it approaches and hits the target weight during powder trickling, rather than seeing the weight jump an entire digit as happens on a digital scale. I can understand why a person would use a digital scale though and it would be basicly for speed as MR stated. I feel that reloading for me is a time of peace and I'm not interested in seeing how many loads I can put out in a hour. Thus my use of the 505 beam with an RCBS trickler.</p></blockquote><p></p>
[QUOTE="Topgun 30-06, post: 794153, member: 28854"] I have no idea how TS23 came up with that explanation of his because, as was stated by MontanaRifleman, it is incorrect, and the example given by MR is spot on. The breaking point on a digital scale is when the weight on the pan is close to the midway point of the minimum graduation that is displayed on the device. Thus, it is just as MR stated in that there shouldn't be more than +/-1/2 that weight that the scale will be off when it is deciding to stay at what it's showing on the display or move to the next figure. That sensitivity test is one that I did in the field during testing of commercial w&m devices as a State W&M Official. In other words, if my target weight is 50 grains of powder and the scale shows it is 50 grains, the actual weight could be 49.5 to 50.5 grains. Depending on the scale sensitivity in use it is probably going to be a little less than that and certainly would not be the large range of error as mentioned by TS23. I would also question the TS23 statement about weighing the paper with and without his name on it on a reloading bench beam scale. That kind of sensitivity can only be seen on a very expensive scale like we had in our Michigan State Metrology Laboratory and not with a device that a person would have available at their home reloading bench. All this being said, I prefer my 505 beam scale because I can see the actual movement in the pointer as it approaches and hits the target weight during powder trickling, rather than seeing the weight jump an entire digit as happens on a digital scale. I can understand why a person would use a digital scale though and it would be basicly for speed as MR stated. I feel that reloading for me is a time of peace and I'm not interested in seeing how many loads I can put out in a hour. Thus my use of the 505 beam with an RCBS trickler. [/QUOTE]
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Lee and RCBS powder scale inaccuracy...
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