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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Velocity swings
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<blockquote data-quote="MontanaRifleman" data-source="post: 482495" data-attributes="member: 11717"><p>Michael, I have the Pro Chrono which is about 16 years old and the Alpha Shooting Chrony which is about 2 yrs old. The Pro chrono "seems" to be more accurate based on published and factory loads.</p><p></p><p>My approach to this is to work up a good load based on 200 yd groups to give the bullets a chance to go to sleep. Any bad grouping loads we can throw out there, because no matter how good the ES, if it doesn't group well at 200 it wont group well at 1000. If it groups well at 200, send a couple of strings down range on a calm day and see what the result is, if your getting less than .5 MOA verticle dispersion, it's probably a good group. Make sense?</p><p></p><p>Not all chronys are created equal and most people don't have the top of the line, so I think it's a safe bet to test what appears to be a good load @ 200 yds, downrange. If a chrony has a margin of error +/- 1/2%, at 3000 fps, that's 30 fps.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 482495, member: 11717"] Michael, I have the Pro Chrono which is about 16 years old and the Alpha Shooting Chrony which is about 2 yrs old. The Pro chrono "seems" to be more accurate based on published and factory loads. My approach to this is to work up a good load based on 200 yd groups to give the bullets a chance to go to sleep. Any bad grouping loads we can throw out there, because no matter how good the ES, if it doesn't group well at 200 it wont group well at 1000. If it groups well at 200, send a couple of strings down range on a calm day and see what the result is, if your getting less than .5 MOA verticle dispersion, it's probably a good group. Make sense? Not all chronys are created equal and most people don't have the top of the line, so I think it's a safe bet to test what appears to be a good load @ 200 yds, downrange. If a chrony has a margin of error +/- 1/2%, at 3000 fps, that's 30 fps. [/QUOTE]
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