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Rifles, Reloading, Optics, Equipment
Reloading
Chronograph
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<blockquote data-quote="planetwaves" data-source="post: 1551403" data-attributes="member: 84697"><p>I bought the Magnetospeed Sporter a couple of years ago. It is very convenient and quite accurate for measuring fps. But on the three rifles I own (a 300 WM and two 270s), at 100 yards, it shifts the point of impact about 6 inches high and significantly widens groups. So I only use it once I have worked up an accurate load. I used to use an older Chrony (beta model I think), but could get quite different results on the same load on different days, depending on sun or clouds, position of sun, etc. Not an issue with the magnetospeed. I also found it frustrating to deal with the rods and shades on the chrony. It was inconvenient to set up when the range was busy and I had to make others wait while I called for an extended cold range to set it up and get it aligned with the rifle. I would also get interference if the shooter next to me was shooting a magnum or had a muzzle brake. Again, no such issues with the magnetospeed. When I first got the magnetospeed, I used it together with the chrony for comparison. The sd and es would be similar, but depending on the lighting, sometimes the average fps would differ by as much as 60 fps. Not good for ordering a CDS dial or compiling a range card for accurate longer range shooting. I have had very good results relying on the magnetospeed for that. In retrospect, I would probably be better off with the lab radar, and I'll probably make that leap at some point.</p></blockquote><p></p>
[QUOTE="planetwaves, post: 1551403, member: 84697"] I bought the Magnetospeed Sporter a couple of years ago. It is very convenient and quite accurate for measuring fps. But on the three rifles I own (a 300 WM and two 270s), at 100 yards, it shifts the point of impact about 6 inches high and significantly widens groups. So I only use it once I have worked up an accurate load. I used to use an older Chrony (beta model I think), but could get quite different results on the same load on different days, depending on sun or clouds, position of sun, etc. Not an issue with the magnetospeed. I also found it frustrating to deal with the rods and shades on the chrony. It was inconvenient to set up when the range was busy and I had to make others wait while I called for an extended cold range to set it up and get it aligned with the rifle. I would also get interference if the shooter next to me was shooting a magnum or had a muzzle brake. Again, no such issues with the magnetospeed. When I first got the magnetospeed, I used it together with the chrony for comparison. The sd and es would be similar, but depending on the lighting, sometimes the average fps would differ by as much as 60 fps. Not good for ordering a CDS dial or compiling a range card for accurate longer range shooting. I have had very good results relying on the magnetospeed for that. In retrospect, I would probably be better off with the lab radar, and I'll probably make that leap at some point. [/QUOTE]
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