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Rifles, Reloading, Optics, Equipment
Reloading
Who thinks my scale is jacked?
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<blockquote data-quote="Stammster" data-source="post: 1991084" data-attributes="member: 114381"><p>I see. If your shot on the first day of shooting at 49.9 was 2905-2915 fps, would you be concerned? Seems that shot was low fps compared to the upward trend from 48.9-49.9gr. Also the 50.1gr was just a bit high fps compared to the trend 50.5-51.7gr. It could easily be 2915-2925 fps. Otherwise I'm not seeing any issue. Temp may have had a little factor, but that should have shifted all the day 2 data.</p><p></p><p>My bet is just random error in those 2 loads, especially the 1 shot at 49.9, since your other 3 shots you mentioned on day 2 seemed to be in line with the trend set on day 1. Again, seating depth, charge, case capacity, bullet weight, neck tension, etc. could have compounded and you are just seeing the outliers in a 25-40 fps ES. Velocity isn't just about charge weight.</p><p></p><p>Also scale calibration from one day to the next is possible. Hopefully not with the proper setup calibration. I always weigh with a 60.00 gr weight to verify, as that is pretty close to much of what I throw. Sometimes it's off a little, and I recalibrate. However, I'm not seeing that either in your case as the straight line velocity trends didn't seem to shift...just the 2 end points.</p><p></p><p>Why not plot data all on the same graph?</p></blockquote><p></p>
[QUOTE="Stammster, post: 1991084, member: 114381"] I see. If your shot on the first day of shooting at 49.9 was 2905-2915 fps, would you be concerned? Seems that shot was low fps compared to the upward trend from 48.9-49.9gr. Also the 50.1gr was just a bit high fps compared to the trend 50.5-51.7gr. It could easily be 2915-2925 fps. Otherwise I’m not seeing any issue. Temp may have had a little factor, but that should have shifted all the day 2 data. My bet is just random error in those 2 loads, especially the 1 shot at 49.9, since your other 3 shots you mentioned on day 2 seemed to be in line with the trend set on day 1. Again, seating depth, charge, case capacity, bullet weight, neck tension, etc. could have compounded and you are just seeing the outliers in a 25-40 fps ES. Velocity isn’t just about charge weight. Also scale calibration from one day to the next is possible. Hopefully not with the proper setup calibration. I always weigh with a 60.00 gr weight to verify, as that is pretty close to much of what I throw. Sometimes it’s off a little, and I recalibrate. However, I’m not seeing that either in your case as the straight line velocity trends didn’t seem to shift...just the 2 end points. Why not plot data all on the same graph? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Who thinks my scale is jacked?
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