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Rifles, Reloading, Optics, Equipment
Reloading
Help interpret first chrony data
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<blockquote data-quote="GSoD" data-source="post: 210205" data-attributes="member: 9534"><p>Thought I would provide an update:</p><p>Looking at the numbers and the insight provided by this board and others I changed some things:</p><p>a) gave my rifle a really good copper cleaning which it hadn't had in a few rounds.</p><p>b) choronographed earlier in the day with more light and total overcast.</p><p>c) got a digital scale. I've never been really comfortable with my working of the balance beam so I got a Lyman 1000 grain scale.</p><p>I loaded up the same batches I ran through the last time and got much better numbers in terms of standard deviation and extreme spread (assuming I'm doing my math right). Here's the best one:</p><p>44.5 GRAINS </p><p> </p><p>1) 2689 fps </p><p>2) 2692 fps </p><p>3) 2686 fps </p><p>4) 2681 fps </p><p>5) 2690 fps </p><p>6) 2692 fps </p><p>7) 2682 fps </p><p>8) 2694 fps </p><p>9) 2701 fps </p><p>10) 2691 fps </p><p>Avg Vel 2689.8 fps</p><p>Extreme Spread 20 fps</p><p>Deviation 5.55 fps</p><p>10 Shot group size 0.717 inches</p><p>10 Shot group MOA 0.685 MOA</p><p> </p><p>The group size got pushed out just a little bit by two hits that landed on the outside edge of the grouping, otherwise it would have been .5 inches. But at the time I had called them as flubbed shots so its something for me to work on.</p><p>Thanks for all the help guys.</p></blockquote><p></p>
[QUOTE="GSoD, post: 210205, member: 9534"] Thought I would provide an update: Looking at the numbers and the insight provided by this board and others I changed some things: a) gave my rifle a really good copper cleaning which it hadn't had in a few rounds. b) choronographed earlier in the day with more light and total overcast. c) got a digital scale. I've never been really comfortable with my working of the balance beam so I got a Lyman 1000 grain scale. I loaded up the same batches I ran through the last time and got much better numbers in terms of standard deviation and extreme spread (assuming I'm doing my math right). Here's the best one: 44.5 GRAINS 1) 2689 fps 2) 2692 fps 3) 2686 fps 4) 2681 fps 5) 2690 fps 6) 2692 fps 7) 2682 fps 8) 2694 fps 9) 2701 fps 10) 2691 fps Avg Vel 2689.8 fps Extreme Spread 20 fps Deviation 5.55 fps 10 Shot group size 0.717 inches 10 Shot group MOA 0.685 MOA The group size got pushed out just a little bit by two hits that landed on the outside edge of the grouping, otherwise it would have been .5 inches. But at the time I had called them as flubbed shots so its something for me to work on. Thanks for all the help guys. [/QUOTE]
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Help interpret first chrony data
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