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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
QuickLOAD way off from reality. Solutions?
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<blockquote data-quote="JKPhoto" data-source="post: 2442946" data-attributes="member: 119271"><p>I will share something that I ran across recently, as it affects powder charge. I left some N570 in the hopper of my Chargemaster Lite for three days before I was able to get back to Load Development ... humidity is low here in NJ this time of year. When I loaded the next test rounds I found that my muzzle velocity increased about 50-60fps from the last test. Confused me.</p><p></p><p>Research led me to the possibility of moisture content of the powder being reduced as it gave up some of its moisture to the air in the room. So I did a test of counting out 30 kernels of powder from the hopper and 30 kernels from the jug of powder. They weighed differently. The powder that was in the hopper weighed less than the fresh powder, causing MORE KERNELS to be used to get to the same charge weight.</p><p></p><p>So I offer this as one possibility of why your results could be different than QuickLoad. Your powder may be different than "factory specs" due to storage issues? Nonetheless, to adapt to actual powder performance, I end up adjusting the Ba Burn Rate (mine tends to be about 5% higher than QL), and the Weighting Factor (I use as an example 0.39 for 6.5 PRC and 300 PRC) so that MV matches the chronographed tested velocities.</p><p></p><p>I have not figured out how to "change the slope" of the velocities so that they match all the way up and down the line instead of at a couple of charge weights. Anyone know how to do that?</p></blockquote><p></p>
[QUOTE="JKPhoto, post: 2442946, member: 119271"] I will share something that I ran across recently, as it affects powder charge. I left some N570 in the hopper of my Chargemaster Lite for three days before I was able to get back to Load Development ... humidity is low here in NJ this time of year. When I loaded the next test rounds I found that my muzzle velocity increased about 50-60fps from the last test. Confused me. Research led me to the possibility of moisture content of the powder being reduced as it gave up some of its moisture to the air in the room. So I did a test of counting out 30 kernels of powder from the hopper and 30 kernels from the jug of powder. They weighed differently. The powder that was in the hopper weighed less than the fresh powder, causing MORE KERNELS to be used to get to the same charge weight. So I offer this as one possibility of why your results could be different than QuickLoad. Your powder may be different than "factory specs" due to storage issues? Nonetheless, to adapt to actual powder performance, I end up adjusting the Ba Burn Rate (mine tends to be about 5% higher than QL), and the Weighting Factor (I use as an example 0.39 for 6.5 PRC and 300 PRC) so that MV matches the chronographed tested velocities. I have not figured out how to "change the slope" of the velocities so that they match all the way up and down the line instead of at a couple of charge weights. Anyone know how to do that? [/QUOTE]
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QuickLOAD way off from reality. Solutions?
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