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Rifles, Reloading, Optics, Equipment
Reloading
brass weight sorting
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<blockquote data-quote="milanuk" data-source="post: 562346" data-attributes="member: 376"><p>Like I mentioned earlier, this will likely be an all winter project for me, between getting the gun back, getting a known good load working in this gun, etc.</p><p> </p><p>One of the things I want to do for this one is construct a 'box' for my chrono, so that the screens are essentially inside a tube to where external lighting levels and angles won't skew the reads. Even with IR screens I've seen some screwy results on days with steep light angles, etc. The two main problems I had last time I messed around with this kind of experiment (actually for my final paper in my intro stats class <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> ) was the gun position moving to the side causing a couple shots to have errant MV as they weren't quite shooting thru the same 'window', and with the length of time involved (3 minutes per shot) you're looking at over 2-1/2 hours for a complete session - lots can happen to the ambient light levels (like clouds) in that time. Hopefully by using IR lighting inside the box (so its effectively the *only* lighting) I can alleviate some of that. I'll also probably be using a front rest and rear bag (or a machine rest if I can find one) to make the position as close to 100% repeatable as possible.</p><p> </p><p>As it turns out, I mis-spoke on the brass. I've already weight sorted all my current batch of brass so I'll grab another box of regular Lapua (not Palma/ small primer) brass for this test - its not like I won't have a use for it afterwards <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> I'll set aside 50 for the test, and use the other 50 for initial load development. I have a set of Wilson dies - a stainless neck die and a stainless micrometer seater die, so that should satisfy Mike's caveat about neck sizing only. Generally I F/L size for a very slight (0.001", +/- 0.0005) bump but I can do it either way for this project.</p><p> </p><p>Also... as I have an ultrasonic cleaner, I can fairly easily de-aerate the water used for filling the cases by putting the container in the tank for say 10 minutes.</p><p> </p><p>Questions: </p><p> </p><p>Do we care about water volume of the virgin (unfired) brass? Do we only want to take this measurement on 1x fired cases? Do we want to take it again on 2x fired cases? Given the tedium of the process involved, I'm leaning towards option B (1x only)...</p><p> </p><p>Do we want the cases cleaned in between firings in any particular way? I have the setups for anything between a quick twist of the neck with #0000 steel wool, to ultrasonic to wet tumbling with stainless pins. The latter probably gets them cleanest, but we'd lose the ability to tell which case was which when they came out. With US you could put them in a rack and keep track of them fairly easily. Does it even matter that they are cleaned down to 'bare metal' for the volume test?</p><p> </p><p>Do we want/need to establish a level of error or uncertainty for the volume measuring process i.e. how consistent/repeatable is it really since we are having to rely to some degree on an 'eyeball' evaluation of the meniscus at the case mouth? Is it something where to do it 'right' we need to take multiple readings (just shoot me now...) on each case and average them?</p><p> </p><p>How far down the rabbit hole do we want to go?</p><p> </p><p>Monte</p></blockquote><p></p>
[QUOTE="milanuk, post: 562346, member: 376"] Like I mentioned earlier, this will likely be an all winter project for me, between getting the gun back, getting a known good load working in this gun, etc. One of the things I want to do for this one is construct a 'box' for my chrono, so that the screens are essentially inside a tube to where external lighting levels and angles won't skew the reads. Even with IR screens I've seen some screwy results on days with steep light angles, etc. The two main problems I had last time I messed around with this kind of experiment (actually for my final paper in my intro stats class ;) ) was the gun position moving to the side causing a couple shots to have errant MV as they weren't quite shooting thru the same 'window', and with the length of time involved (3 minutes per shot) you're looking at over 2-1/2 hours for a complete session - lots can happen to the ambient light levels (like clouds) in that time. Hopefully by using IR lighting inside the box (so its effectively the *only* lighting) I can alleviate some of that. I'll also probably be using a front rest and rear bag (or a machine rest if I can find one) to make the position as close to 100% repeatable as possible. As it turns out, I mis-spoke on the brass. I've already weight sorted all my current batch of brass so I'll grab another box of regular Lapua (not Palma/ small primer) brass for this test - its not like I won't have a use for it afterwards ;) I'll set aside 50 for the test, and use the other 50 for initial load development. I have a set of Wilson dies - a stainless neck die and a stainless micrometer seater die, so that should satisfy Mike's caveat about neck sizing only. Generally I F/L size for a very slight (0.001", +/- 0.0005) bump but I can do it either way for this project. Also... as I have an ultrasonic cleaner, I can fairly easily de-aerate the water used for filling the cases by putting the container in the tank for say 10 minutes. Questions: Do we care about water volume of the virgin (unfired) brass? Do we only want to take this measurement on 1x fired cases? Do we want to take it again on 2x fired cases? Given the tedium of the process involved, I'm leaning towards option B (1x only)... Do we want the cases cleaned in between firings in any particular way? I have the setups for anything between a quick twist of the neck with #0000 steel wool, to ultrasonic to wet tumbling with stainless pins. The latter probably gets them cleanest, but we'd lose the ability to tell which case was which when they came out. With US you could put them in a rack and keep track of them fairly easily. Does it even matter that they are cleaned down to 'bare metal' for the volume test? Do we want/need to establish a level of error or uncertainty for the volume measuring process i.e. how consistent/repeatable is it really since we are having to rely to some degree on an 'eyeball' evaluation of the meniscus at the case mouth? Is it something where to do it 'right' we need to take multiple readings (just shoot me now...) on each case and average them? How far down the rabbit hole do we want to go? Monte [/QUOTE]
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