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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Can someone explain the big difference in velocity?
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<blockquote data-quote="royinidaho" data-source="post: 405589" data-attributes="member: 2011"><p>Just guessin' here. As soon as you post which chrono you're using, the first comment may apply.</p><p></p><p>I figure you're shooting that & SAUM. Also Assuming a brake.</p><p></p><p>Move the chrono farther out. Maybe as much as 12 to 15 feet total.</p><p></p><p>Learned on this forum that on larger cases w/brake low ESs were tough to come by on a regular basis.</p><p></p><p>If the chrono is a Chrony and sunny means bright with small clouds and the clouds sometime shade or partially shade the chrony velocities will vary. Also watch for the shadow of the shade rods crossing the sensor. One sensor in the shade of a rod and the other not, gives me the hebeejeebees.</p><p></p><p>Also I 'think' I've learned that with the Chrony bright means 20-40 FPS higher indicated velocity over a hazy day or when a cloud shades the thing.</p><p></p><p>I cut a 2'x2' piece of 1 inch Styrofoam and shade the whole thing. Seems to help w/consistency.</p></blockquote><p></p>
[QUOTE="royinidaho, post: 405589, member: 2011"] Just guessin' here. As soon as you post which chrono you're using, the first comment may apply. I figure you're shooting that & SAUM. Also Assuming a brake. Move the chrono farther out. Maybe as much as 12 to 15 feet total. Learned on this forum that on larger cases w/brake low ESs were tough to come by on a regular basis. If the chrono is a Chrony and sunny means bright with small clouds and the clouds sometime shade or partially shade the chrony velocities will vary. Also watch for the shadow of the shade rods crossing the sensor. One sensor in the shade of a rod and the other not, gives me the hebeejeebees. Also I 'think' I've learned that with the Chrony bright means 20-40 FPS higher indicated velocity over a hazy day or when a cloud shades the thing. I cut a 2'x2' piece of 1 inch Styrofoam and shade the whole thing. Seems to help w/consistency. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Can someone explain the big difference in velocity?
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