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Rifles, Reloading, Optics, Equipment
Reloading
How to use a chronograph to work up loads?
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<blockquote data-quote="boomtube" data-source="post: 304529" data-attributes="member: 9215"><p>I've never found a chronograph to be any help at all while working up an accurate load, as such. Effective load work-up is read at the target, not the sky screens.</p><p> </p><p>I've never seen any correlation between accuracy and SD/ES. In fact, in my limited experiece and all I've read on the topic suggest the best shooting load is rarely the one with the lowest such numbers but it certainly could happen.</p><p> </p><p>The best use I have for clocking my developement rounds is watching the speed against the book projected results, right up to the listed max speed. Muzzle speed is not a precise measure of chamber pressure but it is a good, general indication that I'm at, or below, or above the commonly accepted pressure limits for any given bullet weight with a given powder. Meaning, mostly, I shoot for groups but limit the upper speed to what my book suggests is right for that combonation. Only one of my several rifles gets higher velocity for a charge than the books suggest.</p><p> </p><p>Now, for long range shooting - beyond 300-400 yards - ES/SD does become significant and it shows in the vertical spread. A chronograph will allow you to see how changes in crimps, primers, brands of brass, etc. can reduce or worsen the velocity extremes.</p></blockquote><p></p>
[QUOTE="boomtube, post: 304529, member: 9215"] I've never found a chronograph to be any help at all while working up an accurate load, as such. Effective load work-up is read at the target, not the sky screens. I've never seen any correlation between accuracy and SD/ES. In fact, in my limited experiece and all I've read on the topic suggest the best shooting load is rarely the one with the lowest such numbers but it certainly could happen. The best use I have for clocking my developement rounds is watching the speed against the book projected results, right up to the listed max speed. Muzzle speed is not a precise measure of chamber pressure but it is a good, general indication that I'm at, or below, or above the commonly accepted pressure limits for any given bullet weight with a given powder. Meaning, mostly, I shoot for groups but limit the upper speed to what my book suggests is right for that combonation. Only one of my several rifles gets higher velocity for a charge than the books suggest. Now, for long range shooting - beyond 300-400 yards - ES/SD does become significant and it shows in the vertical spread. A chronograph will allow you to see how changes in crimps, primers, brands of brass, etc. can reduce or worsen the velocity extremes. [/QUOTE]
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How to use a chronograph to work up loads?
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