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<blockquote data-quote="WildRose" data-source="post: 527184" data-attributes="member: 30902"><p>You didn't mention relative humidity. A bullet will lose velocity slower in dry air vs extremely humid air as moisture creates resistance.</p><p> </p><p>If the humidity was considerably lower than what you calculated that could make a fair amount of difference at long range though it shouldn't make much difference at all out to 400yds.</p><p> </p><p>Remember too that different bullet manufacturers figure ballistic coefficient's a bit differently. Some use averages based on median velocities while other's use just a standard calculation.</p><p> </p><p>Technology cannot replace the value of lots of practice under all sorts of conditions so take good notes of the conditions and performance every time you are out.</p><p> </p><p>Once you have a load properly tuned to your particular rifle that data will be invaluable to you in the future as you will find that quite often the actual performance is going to vary considerably from what the calculations give you.</p></blockquote><p></p>
[QUOTE="WildRose, post: 527184, member: 30902"] You didn't mention relative humidity. A bullet will lose velocity slower in dry air vs extremely humid air as moisture creates resistance. If the humidity was considerably lower than what you calculated that could make a fair amount of difference at long range though it shouldn't make much difference at all out to 400yds. Remember too that different bullet manufacturers figure ballistic coefficient's a bit differently. Some use averages based on median velocities while other's use just a standard calculation. Technology cannot replace the value of lots of practice under all sorts of conditions so take good notes of the conditions and performance every time you are out. Once you have a load properly tuned to your particular rifle that data will be invaluable to you in the future as you will find that quite often the actual performance is going to vary considerably from what the calculations give you. [/QUOTE]
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