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Rifles, Reloading, Optics, Equipment
Reloading
Weighing brass questions
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<blockquote data-quote="MLN1963" data-source="post: 1853525" data-attributes="member: 68159"><p>For those that are interested in the minutiae.</p><p></p><p>I weighed 101 pieces of Lapua 6 Creedmoor SRP straight out of the box.</p><p></p><p>170.48 Heaviest</p><p>169.30 Lightest</p><p>169.72 Average</p><p>169.89 Median</p><p>1.18 Extreme Spread</p><p>0.22 Standard Deviation</p><p></p><p>I weighed 100 pieces of Alpha 25 Creedmoor SRP straight out of the box.</p><p></p><p>157.92 Heaviest</p><p>157.28 Lightest</p><p>157.69 Average</p><p>157.60 Median</p><p>.64 Extreme Spread</p><p>.15 Standard Deviation</p><p></p><p>Yep, boutique brass is pretty consistent.</p><p></p><p>Dry weight is the easiest and most convenient method. IMO the only way for it to be valid is from the same lot of brass. Punches wear, extractor grooves may be slightly wider or deeper, cups may be slightly different from the start. Many many variables to account for.</p><p></p><p>Water weight can give a better reflection of the internal volume of the case and should provide better indication of how closely the loaded ammunition should perform. The problem is water weight testing is a pain in the @$$. It's messy, time consuming and very difficult to do precisely for every round. The meniscus that forms on the top of the case is very difficult to get perfectly flat. A slight convex (dome) or a slight convex (dip) can make quite a difference in weight. Not to mention if there is an air bubble attached to the case wall that you can't see.</p><p></p><p>I tested water volume on 18 random fired Alpha cases from another box, same lot, and had a .3 grain ES and .08 SD. Not horrible at all. I'd bet that my testing methods induced that higher extreme spread because the meniscus wasn't perfectly the same among those 18 cases.</p><p></p><p>My takeaway from all this is buy quality brass, dry weight check it, cull any outliers (if there are any) and get to shooting. Wind will effect my results more than a case that weights .2 grains more. I bang steel and hunt, no benchrest. YMMV</p></blockquote><p></p>
[QUOTE="MLN1963, post: 1853525, member: 68159"] For those that are interested in the minutiae. I weighed 101 pieces of Lapua 6 Creedmoor SRP straight out of the box. 170.48 Heaviest 169.30 Lightest 169.72 Average 169.89 Median 1.18 Extreme Spread 0.22 Standard Deviation I weighed 100 pieces of Alpha 25 Creedmoor SRP straight out of the box. 157.92 Heaviest 157.28 Lightest 157.69 Average 157.60 Median .64 Extreme Spread .15 Standard Deviation Yep, boutique brass is pretty consistent. Dry weight is the easiest and most convenient method. IMO the only way for it to be valid is from the same lot of brass. Punches wear, extractor grooves may be slightly wider or deeper, cups may be slightly different from the start. Many many variables to account for. Water weight can give a better reflection of the internal volume of the case and should provide better indication of how closely the loaded ammunition should perform. The problem is water weight testing is a pain in the @$$. It’s messy, time consuming and very difficult to do precisely for every round. The meniscus that forms on the top of the case is very difficult to get perfectly flat. A slight convex (dome) or a slight convex (dip) can make quite a difference in weight. Not to mention if there is an air bubble attached to the case wall that you can’t see. I tested water volume on 18 random fired Alpha cases from another box, same lot, and had a .3 grain ES and .08 SD. Not horrible at all. I’d bet that my testing methods induced that higher extreme spread because the meniscus wasn’t perfectly the same among those 18 cases. My takeaway from all this is buy quality brass, dry weight check it, cull any outliers (if there are any) and get to shooting. Wind will effect my results more than a case that weights .2 grains more. I bang steel and hunt, no benchrest. YMMV [/QUOTE]
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Weighing brass questions
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