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Rifles, Reloading, Optics, Equipment
Reloading
Two Distinct Velocity Groups Today...?
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<blockquote data-quote="planetwaves" data-source="post: 1745468" data-attributes="member: 84697"><p>I had a similar situation a few years ago and it turned out to be the chronograph. I became a member of a nice shooting club where the various rifle ranges are oriented north to south. I had developed an accurate load for a 270 win and a 300 wm and wanted to get final fps to order CDS dials. I had loaded 100 rounds of each and took some to the range. It was very early in the morning. The results I got were somewhat slower with wider spread than expected on both rifles. I noticed that the sun was beating down from the east, and the "shades" on the chrony were not effective at that angle. I taped a target on the side of the shades to block the direct sunlight, and tried again. The results were quite different. As I recall, about 40-50 fps higher with tighter spread. But a slight wind hit and blew the chrony over (the target I taped on acted like a sail).</p><p></p><p>Another shooter saw what happened and invited me to his bench, where he showed me his magnetospeed. He showed how easy it is to set up and explained that it isn't dependent on lighting conditions. I stopped at Cabelas on the way home and bought one. It is very consistent over batches of loads with the same components. The only time I see different fps is if I load a batch of 270 with different brass (e.g., hornady vs Nosler). Of course, I can compensate for that by having a slightly different powder charge for each brand of brass. Month to month, year to year, loads from a previous year, etc. are all consistent.</p></blockquote><p></p>
[QUOTE="planetwaves, post: 1745468, member: 84697"] I had a similar situation a few years ago and it turned out to be the chronograph. I became a member of a nice shooting club where the various rifle ranges are oriented north to south. I had developed an accurate load for a 270 win and a 300 wm and wanted to get final fps to order CDS dials. I had loaded 100 rounds of each and took some to the range. It was very early in the morning. The results I got were somewhat slower with wider spread than expected on both rifles. I noticed that the sun was beating down from the east, and the "shades" on the chrony were not effective at that angle. I taped a target on the side of the shades to block the direct sunlight, and tried again. The results were quite different. As I recall, about 40-50 fps higher with tighter spread. But a slight wind hit and blew the chrony over (the target I taped on acted like a sail). Another shooter saw what happened and invited me to his bench, where he showed me his magnetospeed. He showed how easy it is to set up and explained that it isn't dependent on lighting conditions. I stopped at Cabelas on the way home and bought one. It is very consistent over batches of loads with the same components. The only time I see different fps is if I load a batch of 270 with different brass (e.g., hornady vs Nosler). Of course, I can compensate for that by having a slightly different powder charge for each brand of brass. Month to month, year to year, loads from a previous year, etc. are all consistent. [/QUOTE]
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Two Distinct Velocity Groups Today...?
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