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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
going from 600 to 800 yards
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<blockquote data-quote="goodgrouper" data-source="post: 138490" data-attributes="member: 2852"><p>[ QUOTE ]</p><p> Even so how does one reduce the extreme spread? I measure each powder charge on an electronic scale so that every one weighs exactly the same (to the nearest 0.1 grain) and use Federal Match primers. What else can I do to ensure the smallest extreme spreads? Thanks </p><p></p><p>[/ QUOTE ] </p><p></p><p>Brian,</p><p>Even if you have the powder charge measured out to the very last kernel exactly, some powders and/or charges will never give good extreme spreads. You can only work up each load over a chronograph and "map" the powder you are using to find accuracy/combustion nodes that yeild small spreads.</p><p></p><p>Some loads might have a standard deviation (I'll use this from now on because it is a little more accurate than using extreme spreads) in the single digits but produce horrific groups. ANd some loads have razor edge accuracy but horrible standard deviations. The trick is finding a load that has good accuracy and good deviations. Once this has been tested a few times and the accuracy and uniformity have remained the same, you will have found the optimum load for your particular components and rifle. Now you can change the temperature 40 degrees or so and the load will usually hold onto it's uniformity and accuracy even if the overall speed increases or decreases. </p><p></p><p>SO, now it is 50 degrees colder than when you worked up the load. So we go out and check it again over the chrono a week or so before your hunt so the temps will be similiar and refigure our charts for the velocity change and do any final tweaking.</p><p></p><p>However, a good portion of guns/cartidge combos will totally change their accuracy and deviation nodes in temperature changes. If your gun is one of these, than count yourself among the unlucky. This is not a huge probelm, it just means that you will have to have a summer and a winter load. And if your gun is really picky, you might have to have a spring and fall load as well. So this means you will be finding two or three or four accuracy nodes on the same gun. Count on spending lots of time shooting over the chrono in this case!</p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 138490, member: 2852"] [ QUOTE ] Even so how does one reduce the extreme spread? I measure each powder charge on an electronic scale so that every one weighs exactly the same (to the nearest 0.1 grain) and use Federal Match primers. What else can I do to ensure the smallest extreme spreads? Thanks [/ QUOTE ] Brian, Even if you have the powder charge measured out to the very last kernel exactly, some powders and/or charges will never give good extreme spreads. You can only work up each load over a chronograph and "map" the powder you are using to find accuracy/combustion nodes that yeild small spreads. Some loads might have a standard deviation (I'll use this from now on because it is a little more accurate than using extreme spreads) in the single digits but produce horrific groups. ANd some loads have razor edge accuracy but horrible standard deviations. The trick is finding a load that has good accuracy and good deviations. Once this has been tested a few times and the accuracy and uniformity have remained the same, you will have found the optimum load for your particular components and rifle. Now you can change the temperature 40 degrees or so and the load will usually hold onto it's uniformity and accuracy even if the overall speed increases or decreases. SO, now it is 50 degrees colder than when you worked up the load. So we go out and check it again over the chrono a week or so before your hunt so the temps will be similiar and refigure our charts for the velocity change and do any final tweaking. However, a good portion of guns/cartidge combos will totally change their accuracy and deviation nodes in temperature changes. If your gun is one of these, than count yourself among the unlucky. This is not a huge probelm, it just means that you will have to have a summer and a winter load. And if your gun is really picky, you might have to have a spring and fall load as well. So this means you will be finding two or three or four accuracy nodes on the same gun. Count on spending lots of time shooting over the chrono in this case! Hope this helps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
going from 600 to 800 yards
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