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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: 209124" data-attributes="member: 9534"><p>Hey all,</p><p></p><p>So I bought a chronograph and ran my latest reloads through it. Can you help me interpret the data?</p><p></p><p>I fired three loads of Varget at 44.4g, 44.5g, and 44.6g (each with federal brass, cci primers & 175g Sierra MatchKing in .308). I'm reloading with off the shelf Lyman and RCBS equipment and lee dies. I didn't seperate brass or bullets by volume or weight.</p><p></p><p>Its being shot out of a Rem700P, off a bench with rests at both ends on a virtually windless day. </p><p></p><p>I haven't played with getting closer to the lands because I want it to magazine feed so I've kept it at the book length. </p><p></p><p>I posted the velocities, group sizes, standard deviation etc.</p><p></p><p>I'm wanting to use this as my long range target round. </p><p></p><p>I'm thinking 44.6 grains is in a good spot.</p><p></p><p>Do you figure the velocities and deviations acceptable? If not, where should I start looking to improve?</p><p></p><p>Any help appreciated.</p><p></p><p>Thanks,</p><p></p><p>ST</p><p></p><p> </p><p>***44.4 GRAINS***</p><p>GROUP1 shot at 100 yards </p><p>Shot 1 2702 fps </p><p>Shot 2 2718 fps </p><p>Shot 3 2728 fps </p><p>Shot 4 2726 fps </p><p>Shot 5 2764 fps </p><p>Avg Vel Grp1 2727.6 fps </p><p>5 Shot Group Size 1.2 inches</p><p>5 Shot Group MOA 1.256 MOA</p><p>GROUP2 shot at 100 yards </p><p>Shot 6 2710 fps</p><p>Shot 7 2784 fps </p><p>Shot 8 2812 fps </p><p>Shot 9 2799 fps </p><p>Shot 10 2821 fps </p><p>Avg Vel Grp2 2785.2 fps </p><p>5 Shot Group Size 0.547 inches </p><p>5 Shot Group MOA 0.573 MOA </p><p> </p><p>Avg Vel Total 2756.4 fps </p><p>Velocity Spread 119 fps </p><p>10 Sht AVG Grp Sz 0.8735 inches </p><p>10 Shot AVG MOA 0.915 MOA </p><p>Bias Standard Dev 42.68 fps</p><p>***44.5 GRAINs***</p><p> </p><p>GROUP1 shot at 100 yards </p><p>Shot 1 2821 fps </p><p>Shot 2 2821 fps </p><p>Shot 3 2821 fps </p><p>Shot 4 2801 fps </p><p>Shot 5 2775 fps </p><p>Avg Vel Grp1 2807.8 fps </p><p>5 Shot Group Size 0.56 inches </p><p>5 Shot Group MOA 0.586 MOA</p><p>GROUP2 shot at 100 yards </p><p>Shot 6 2754 fps </p><p>Shot 7 2702 fps </p><p>Shot 8 2669 fps </p><p>Shot 9 2655 fps </p><p>Shot 10 2629 fps </p><p>Avg Vel Grp2 2681.8 fps </p><p>5 Shot Group Size 0.992 inches </p><p>5 Shot Group MOA 1.039 MOA </p><p> </p><p>Avg Vel Total 2744.8 fps </p><p>Velocity Spread 192 fps </p><p>10 Sht AVG Grp Sz 0.776 inches </p><p>10 Shot AVG MOA 0.812 MOA </p><p>Bias Standard Dev 71.15 fps</p><p>****44.6 GRAINS**** </p><p>GROUP1 shot at 100 yards </p><p>Shot 1 2603 fps</p><p>Shot 2 2652 fps </p><p>Shot 3 2680 fps </p><p>Shot 4 2741 fps </p><p>Shot 5 2731 fps </p><p>Avg Vel Grp1 2681.4 fps</p><p>5 Shot Group Size 0.553 inches</p><p>5 Shot Group MOA 0.579 MOA</p><p>GROUP2 shot at 100 yards </p><p>Shot 6 2773 fps </p><p>Shot 7 2746 fps </p><p>Shot 8 2709 fps </p><p>Shot 9 2723 fps </p><p>Shot 10 2743 fps </p><p>Avg Vel Grp2 2738.8 fps </p><p>5 Shot Group Size 0.762 </p><p>5 Shot Group MOA 0.798 </p><p> </p><p>Avg Vel Total 2710.1 fps </p><p>Velocity Spread 170 fps </p><p>10 Sht AVG Grp Sz 0.6575 inches </p><p>10 Shot AVG MOA 0.688 MOA </p><p>Bias Standard Dev 48.62 fps</p></blockquote><p></p>
[QUOTE="GSoD, post: 209124, member: 9534"] Hey all, So I bought a chronograph and ran my latest reloads through it. Can you help me interpret the data? I fired three loads of Varget at 44.4g, 44.5g, and 44.6g (each with federal brass, cci primers & 175g Sierra MatchKing in .308). I'm reloading with off the shelf Lyman and RCBS equipment and lee dies. I didn't seperate brass or bullets by volume or weight. Its being shot out of a Rem700P, off a bench with rests at both ends on a virtually windless day. I haven't played with getting closer to the lands because I want it to magazine feed so I've kept it at the book length. I posted the velocities, group sizes, standard deviation etc. I'm wanting to use this as my long range target round. I'm thinking 44.6 grains is in a good spot. Do you figure the velocities and deviations acceptable? If not, where should I start looking to improve? Any help appreciated. Thanks, ST ***44.4 GRAINS*** GROUP1 shot at 100 yards Shot 1 2702 fps Shot 2 2718 fps Shot 3 2728 fps Shot 4 2726 fps Shot 5 2764 fps Avg Vel Grp1 2727.6 fps 5 Shot Group Size 1.2 inches 5 Shot Group MOA 1.256 MOA GROUP2 shot at 100 yards Shot 6 2710 fps Shot 7 2784 fps Shot 8 2812 fps Shot 9 2799 fps Shot 10 2821 fps Avg Vel Grp2 2785.2 fps 5 Shot Group Size 0.547 inches 5 Shot Group MOA 0.573 MOA Avg Vel Total 2756.4 fps Velocity Spread 119 fps 10 Sht AVG Grp Sz 0.8735 inches 10 Shot AVG MOA 0.915 MOA Bias Standard Dev 42.68 fps ***44.5 GRAINs*** GROUP1 shot at 100 yards Shot 1 2821 fps Shot 2 2821 fps Shot 3 2821 fps Shot 4 2801 fps Shot 5 2775 fps Avg Vel Grp1 2807.8 fps 5 Shot Group Size 0.56 inches 5 Shot Group MOA 0.586 MOA GROUP2 shot at 100 yards Shot 6 2754 fps Shot 7 2702 fps Shot 8 2669 fps Shot 9 2655 fps Shot 10 2629 fps Avg Vel Grp2 2681.8 fps 5 Shot Group Size 0.992 inches 5 Shot Group MOA 1.039 MOA Avg Vel Total 2744.8 fps Velocity Spread 192 fps 10 Sht AVG Grp Sz 0.776 inches 10 Shot AVG MOA 0.812 MOA Bias Standard Dev 71.15 fps ****44.6 GRAINS**** GROUP1 shot at 100 yards Shot 1 2603 fps Shot 2 2652 fps Shot 3 2680 fps Shot 4 2741 fps Shot 5 2731 fps Avg Vel Grp1 2681.4 fps 5 Shot Group Size 0.553 inches 5 Shot Group MOA 0.579 MOA GROUP2 shot at 100 yards Shot 6 2773 fps Shot 7 2746 fps Shot 8 2709 fps Shot 9 2723 fps Shot 10 2743 fps Avg Vel Grp2 2738.8 fps 5 Shot Group Size 0.762 5 Shot Group MOA 0.798 Avg Vel Total 2710.1 fps Velocity Spread 170 fps 10 Sht AVG Grp Sz 0.6575 inches 10 Shot AVG MOA 0.688 MOA Bias Standard Dev 48.62 fps [/QUOTE]
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