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Hunting
Long Range Hunting & Shooting
300 Norma Improved. Load testing, info, and builds
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<blockquote data-quote="rpierce" data-source="post: 1744084" data-attributes="member: 20643"><p>I went back and looked at my notes. For some reason my velocity was about 7 fps slower than it should of been. I got to thinking about how that would be possible considering id shot it a couple days ago and had a different velocity. N570 is extremely temp stable. Like .1 fps per degree. I got to thinking about it and realized that i had left my powder in the powder dispenser for a few days. So to test my theory I opened a fresh jug of N570 and dumped a bunch of powder into my pan and put it on my Sartorious Entris Scale. It is a crazy accurate scale. I can cut a kernel of powder into several pieces and it will pick up the cut kernel. Two days later my 118.484 powder charge weighs 118.338 gr. About .15 gr difference just from sitting in the pan. That's roughly the equivalant of 6-7 fps. That difference isn't from the scale drifting. I took the charge out of the pan and weighed the pan and it was perfectly zeroed. Put the charge back in the pan and it weighed 118.338 gr of powder. My only thoughts as to how this happened is that maybe a coating or something dried off from sitting in the pan for a few days. Ill go and try a load of 91.7 gr and see if that brings me back into the sub inch vertical at 1000 yd node.</p></blockquote><p></p>
[QUOTE="rpierce, post: 1744084, member: 20643"] I went back and looked at my notes. For some reason my velocity was about 7 fps slower than it should of been. I got to thinking about how that would be possible considering id shot it a couple days ago and had a different velocity. N570 is extremely temp stable. Like .1 fps per degree. I got to thinking about it and realized that i had left my powder in the powder dispenser for a few days. So to test my theory I opened a fresh jug of N570 and dumped a bunch of powder into my pan and put it on my Sartorious Entris Scale. It is a crazy accurate scale. I can cut a kernel of powder into several pieces and it will pick up the cut kernel. Two days later my 118.484 powder charge weighs 118.338 gr. About .15 gr difference just from sitting in the pan. That's roughly the equivalant of 6-7 fps. That difference isn't from the scale drifting. I took the charge out of the pan and weighed the pan and it was perfectly zeroed. Put the charge back in the pan and it weighed 118.338 gr of powder. My only thoughts as to how this happened is that maybe a coating or something dried off from sitting in the pan for a few days. Ill go and try a load of 91.7 gr and see if that brings me back into the sub inch vertical at 1000 yd node. [/QUOTE]
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300 Norma Improved. Load testing, info, and builds
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