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Rifles, Reloading, Optics, Equipment
Reloading
Trying to understand sd and es in load development
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<blockquote data-quote="Greyfox" data-source="post: 1573282" data-attributes="member: 10291"><p>For LR hunting and competition, regardless of how tight our groups are at the shorter ranges(<300 yards), vertical dispersion(high ES/SD) will rear it's ugly head at the longer ranges. It's easy enough to determine the effect of your ES value at your desired maximum range. Once you determine a repeatable average velocity and extreme spread, plug the velocity extremes of the ES value into your Ballistic calculator using the maximum range and conditions you plan to hunt/shoot. For example, if your average velocity is 3000FPS and you have an ES of 40FPS, look at the impact points of 2980FPS and 3020FPS(Extreme spread in velocity), and determine the difference of each impact point compared to the impact point of your average velocity. If the difference takes you out of your target zone you either have to reduce your max distance until it matches your target zone, or work on your load to lower the ES to match the target zone. I will usually work with actual ES values and average velocity, and will test a minimum of 3 or 4, 5 shot groups in varied conditions(temperatures) for reproducibility. Just some thoughts.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1573282, member: 10291"] For LR hunting and competition, regardless of how tight our groups are at the shorter ranges(<300 yards), vertical dispersion(high ES/SD) will rear it’s ugly head at the longer ranges. It’s easy enough to determine the effect of your ES value at your desired maximum range. Once you determine a repeatable average velocity and extreme spread, plug the velocity extremes of the ES value into your Ballistic calculator using the maximum range and conditions you plan to hunt/shoot. For example, if your average velocity is 3000FPS and you have an ES of 40FPS, look at the impact points of 2980FPS and 3020FPS(Extreme spread in velocity), and determine the difference of each impact point compared to the impact point of your average velocity. If the difference takes you out of your target zone you either have to reduce your max distance until it matches your target zone, or work on your load to lower the ES to match the target zone. I will usually work with actual ES values and average velocity, and will test a minimum of 3 or 4, 5 shot groups in varied conditions(temperatures) for reproducibility. Just some thoughts. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Trying to understand sd and es in load development
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