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Rifles, Reloading, Optics, Equipment
Reloading
Revisiting: sorting cases by weight
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<blockquote data-quote="Buster Hemlock" data-source="post: 1660465" data-attributes="member: 109327"><p>Hopefully this isn't too long winded or confusing. When this post first popped up it got me thinking about some nosler 6.5 creedmoor brass I've been getting from a guy at the range that doesn't reload. I've got close to 900 pieces off him piled up for use in a AR-10 and they are from 7 different lots. They are still in the boxes, so I decided to sort some from different lots by weight and then measure capacity to see if the lots with similar weight could all be combined. I pulled six cases, three cases each from two separate lots that weighed within .2 grains, 161.1-161.2 gr. of each other. This took a while sorting through a lot of brass to find lots with similar weights that I thought may be worth combining. Within the individual lots capacity was within .1 gr. H2O for the cases I was comparing. Yes this is a small sample size. But between the two lots with virtually identical weight the difference was .4 gr. H2O. I then took the heaviest and lightest from the two separate lots and came up with a case weight difference of just over 3 grains. I measured internal capacity of the cartridges on the extreme ends and had a H20 capacity difference of .5 gr. H2O from one lot and .6 gr. H2O from the other. To me it seems that weight sorting within a lot is probably a reasonable way to ascertain internal volume. Mixing lots may not be advisable as it would lead to larger variation of internal capacity even though the case weights are similar. I threw my load info into Quickload and found a .5 grain variation of internal capacity corresponded to a theoretical 15 fps difference and 1.1 grains difference corresponded to 33 fps. So I guess it comes down to what your looking for but if your trying to shrink SD and ES I'd spend some time doing some experimenting and deciding for yourself what's worth your time. I'll be keeping the lots separate and weight sorting to minimize variation. I'm probably going to find 50 cases within 1.0 gr. case weight and take the time and test capacity and see if sorting by case weight holds up for myself.</p></blockquote><p></p>
[QUOTE="Buster Hemlock, post: 1660465, member: 109327"] Hopefully this isn't too long winded or confusing. When this post first popped up it got me thinking about some nosler 6.5 creedmoor brass I've been getting from a guy at the range that doesn't reload. I've got close to 900 pieces off him piled up for use in a AR-10 and they are from 7 different lots. They are still in the boxes, so I decided to sort some from different lots by weight and then measure capacity to see if the lots with similar weight could all be combined. I pulled six cases, three cases each from two separate lots that weighed within .2 grains, 161.1-161.2 gr. of each other. This took a while sorting through a lot of brass to find lots with similar weights that I thought may be worth combining. Within the individual lots capacity was within .1 gr. H2O for the cases I was comparing. Yes this is a small sample size. But between the two lots with virtually identical weight the difference was .4 gr. H2O. I then took the heaviest and lightest from the two separate lots and came up with a case weight difference of just over 3 grains. I measured internal capacity of the cartridges on the extreme ends and had a H20 capacity difference of .5 gr. H2O from one lot and .6 gr. H2O from the other. To me it seems that weight sorting within a lot is probably a reasonable way to ascertain internal volume. Mixing lots may not be advisable as it would lead to larger variation of internal capacity even though the case weights are similar. I threw my load info into Quickload and found a .5 grain variation of internal capacity corresponded to a theoretical 15 fps difference and 1.1 grains difference corresponded to 33 fps. So I guess it comes down to what your looking for but if your trying to shrink SD and ES I'd spend some time doing some experimenting and deciding for yourself what's worth your time. I'll be keeping the lots separate and weight sorting to minimize variation. I'm probably going to find 50 cases within 1.0 gr. case weight and take the time and test capacity and see if sorting by case weight holds up for myself. [/QUOTE]
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Reloading
Revisiting: sorting cases by weight
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