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Rifles, Reloading, Optics, Equipment
Reloading
Forgiveness in reloading and what one is looking for to achieve that.
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<blockquote data-quote="QuietTexan" data-source="post: 2255128" data-attributes="member: 116181"><p>Look at a trace track of a golf ball - bullets fly in similar ballistic arcs. You can put the bullet on a path that arcs an inch away from another path at 100 yards but happens to be right on top at 400 yards then off again at 600 yards.</p><p></p><p>When we do the ballistic calculations on a shot what is happening is the rifle launches the bullet into a probability cone we calculated the size of which is controlled by non-deterministic variables that surround a specific arc defined by the deterministic variables of ballistics. Inside the cone shot traces will potentially cross at different places, but the statistics will bear out that shots remain inside the overall area of where they should go. At any given arbitrary point in the cone different tracks may or may not align, but the size of the cone is what we care about because that's where all the shots go. (Cone might not be the exact right shape, but as distance increases the cumulative error of variables increases, so the shape gets larger the longer it goes, so like a bendy twisty cone)</p><p></p><p>All the science of handloading is focused on minimizing the variation in (non-deterministic) muzzle velocity and barrel whip harmonics. Range is deterministic and wind is non-deterministic. But errors in those two variables are about 5 times more impactful on a shot than the internal ballistic variations of the load itself. Largely because while anyone who loads can usually beat factory ammo SD of 15fps, getting to sub-10fps SD is a fairly small incremental gain from handloading, especially compared to changing from being +/- 50 yards eyeballing or milling distance in a reticle versus using a laser range finder to get to +/- 5 yards. Much larger gain in the accurate distance than improving SD by 5fps.</p><p></p><p>[URL unfurl="true"]https://www.longrangehunting.com/articles/applied-ballistics-for-long-range-shooting.248/[/URL]</p><p></p><p>More of his stuff:</p><p>[URL unfurl="true"]https://appliedballisticsllc.com/education/[/URL]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2255128, member: 116181"] Look at a trace track of a golf ball - bullets fly in similar ballistic arcs. You can put the bullet on a path that arcs an inch away from another path at 100 yards but happens to be right on top at 400 yards then off again at 600 yards. When we do the ballistic calculations on a shot what is happening is the rifle launches the bullet into a probability cone we calculated the size of which is controlled by non-deterministic variables that surround a specific arc defined by the deterministic variables of ballistics. Inside the cone shot traces will potentially cross at different places, but the statistics will bear out that shots remain inside the overall area of where they should go. At any given arbitrary point in the cone different tracks may or may not align, but the size of the cone is what we care about because that's where all the shots go. (Cone might not be the exact right shape, but as distance increases the cumulative error of variables increases, so the shape gets larger the longer it goes, so like a bendy twisty cone) All the science of handloading is focused on minimizing the variation in (non-deterministic) muzzle velocity and barrel whip harmonics. Range is deterministic and wind is non-deterministic. But errors in those two variables are about 5 times more impactful on a shot than the internal ballistic variations of the load itself. Largely because while anyone who loads can usually beat factory ammo SD of 15fps, getting to sub-10fps SD is a fairly small incremental gain from handloading, especially compared to changing from being +/- 50 yards eyeballing or milling distance in a reticle versus using a laser range finder to get to +/- 5 yards. Much larger gain in the accurate distance than improving SD by 5fps. [URL unfurl="true"]https://www.longrangehunting.com/articles/applied-ballistics-for-long-range-shooting.248/[/URL] More of his stuff: [URL unfurl="true"]https://appliedballisticsllc.com/education/[/URL] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Forgiveness in reloading and what one is looking for to achieve that.
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