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Rifles, Reloading, Optics, Equipment
Reloading
Chronograph recomendations
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<blockquote data-quote="goodgrouper" data-source="post: 208724" data-attributes="member: 2852"><p>Waiting for a 5 shot string when it won't tell you much more than a 3 shot string is very hard to do sometimes. I run a fully operational ballistics lab and I simply don't have all day to wait for barrels to cool down from five shot strings. So I do three and I have never had any gun not hit a 22" gong at 1000 yards using load development methods with 3 shots strings. If the load won't get a low sd on the first go around, it gets left out. BUt if it does, and produces good accuracy and is in a node, it gets re-tested on another day. In this way, I quickly narrow down what load the gun wants without shooting another 60% more ammo down the barrel.</p><p></p><p>ANd in the world of statistics, standard deviation is the function used mainly and for good reason. It's predictions are much more valuable especially on large quantities of data with similar factors. You could have one shot out of 50 go up in speed 100 fps and you're ES would be horrible. But the SD would show that there was something up with that one round like an extra thick neck, carbon build up, bad charge and so on but the load is still good.</p><p></p><p>Like I said earlier, ES and SD are related and for all purposes pertaining to our needs, either work fine if you know what to look for.</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 208724, member: 2852"] Waiting for a 5 shot string when it won't tell you much more than a 3 shot string is very hard to do sometimes. I run a fully operational ballistics lab and I simply don't have all day to wait for barrels to cool down from five shot strings. So I do three and I have never had any gun not hit a 22" gong at 1000 yards using load development methods with 3 shots strings. If the load won't get a low sd on the first go around, it gets left out. BUt if it does, and produces good accuracy and is in a node, it gets re-tested on another day. In this way, I quickly narrow down what load the gun wants without shooting another 60% more ammo down the barrel. ANd in the world of statistics, standard deviation is the function used mainly and for good reason. It's predictions are much more valuable especially on large quantities of data with similar factors. You could have one shot out of 50 go up in speed 100 fps and you're ES would be horrible. But the SD would show that there was something up with that one round like an extra thick neck, carbon build up, bad charge and so on but the load is still good. Like I said earlier, ES and SD are related and for all purposes pertaining to our needs, either work fine if you know what to look for. [/QUOTE]
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