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Rifles, Reloading, Optics, Equipment
Reloading
How critical is measuring powder to .01 grains
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<blockquote data-quote="lowdowndirtybugger" data-source="post: 2785178" data-attributes="member: 88303"><p>In my opinion this all depends on just exactly what you are doing and what is an acceptable outcome.</p><p>Most people here chase the smallest SD and es possible. Why?</p><p>Because even a difference of 5 fps can be a big difference at extended ranges.</p><p>If one is trying to eliminate every variable possible than this is one variable that can be taken off the table with ease.</p><p>When we look at probably the most popular cartridge the 6.5 need more we can show where even .02 may make a difference.</p><p>Let's say the mean velocity of said 6.5 is 2800 fps and it takes 40 grains to get there. That means every grain is responsible for 70 fps. And every 10th equals 7 fps </p><p>The difference at 1 mile for 7 fps at my elevation is .6 minutes in elevation (with my load) between just one 10th grain deviation. Measuring to the hundredth takes this out of the equation. This is one of many things people do to get single digit es and as small as possible sd </p><p></p><p>Most loading scales also at plus or minus on top of that meaning that .1 could be .025 or .175 before the reading changes.</p><p>This can cause .2 deviation between loads easily. If your tightest powder measure is .2 deviation that you probably won't ever see single digit es or SD and your down range vertical dispersion will probably show it.</p><p></p><p>There are plenty of scales now days that will weigh a charge within .02 in 10 to 15 seconds.</p><p></p><p>If you are shooting elr charge weight is definitely within bounds for worry especially with low volume cartridges </p><p>If shooting 1k and you're really not worried about vertical dispersion much than a 10th would probably be just fine</p></blockquote><p></p>
[QUOTE="lowdowndirtybugger, post: 2785178, member: 88303"] In my opinion this all depends on just exactly what you are doing and what is an acceptable outcome. Most people here chase the smallest SD and es possible. Why? Because even a difference of 5 fps can be a big difference at extended ranges. If one is trying to eliminate every variable possible than this is one variable that can be taken off the table with ease. When we look at probably the most popular cartridge the 6.5 need more we can show where even .02 may make a difference. Let's say the mean velocity of said 6.5 is 2800 fps and it takes 40 grains to get there. That means every grain is responsible for 70 fps. And every 10th equals 7 fps The difference at 1 mile for 7 fps at my elevation is .6 minutes in elevation (with my load) between just one 10th grain deviation. Measuring to the hundredth takes this out of the equation. This is one of many things people do to get single digit es and as small as possible sd Most loading scales also at plus or minus on top of that meaning that .1 could be .025 or .175 before the reading changes. This can cause .2 deviation between loads easily. If your tightest powder measure is .2 deviation that you probably won't ever see single digit es or SD and your down range vertical dispersion will probably show it. There are plenty of scales now days that will weigh a charge within .02 in 10 to 15 seconds. If you are shooting elr charge weight is definitely within bounds for worry especially with low volume cartridges If shooting 1k and you're really not worried about vertical dispersion much than a 10th would probably be just fine [/QUOTE]
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How critical is measuring powder to .01 grains
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