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Rifles, Reloading, Optics, Equipment
Reloading
Weighing Powder - How precise is good enough?
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<blockquote data-quote="338winmag" data-source="post: 534163" data-attributes="member: 29912"><p>Some very good points in this thread.</p><p> </p><p>I recently purchased the RCBS CM 1500 scale\dispenser. Mikecr has the CM discernment down perfectly. </p><p> </p><p><u><strong>Drifting</strong></u> - I have seen a +.2 or +.3 drifting a few times if I walk away and come back 30 minutes later. I have also seen it hold perfectly for longer times so this is just one thing to take into consideration. </p><p> </p><p><u><strong>Avalanche kernel fall</strong></u> - yup.. I see this happen on occasion. I modify by either dumping the load and redispensing or I remove a kernel or two and re-weigh to make the load useable.</p><p> </p><p><strong><u>Customized settings </u></strong>-some neat things can be done to one's custom liking. Just make sure you "know" what you are really doing.</p><p> </p><p><strong><u>The straw thing</u></strong> - I have to research that a bit more.</p><p> </p><p> </p><p><strong><u>More Accurate Scales</u></strong> - Reviewing my reloading practices and results, I believe Boomtube has a very clear understanding if there is a need for a scale more precise. </p><p> </p><p>In my reloading experience I also have found there is a "window or range of margin" within the tuned powder charge. That window is almost always + or - .1 (e.g. tuned charge = 57.2; deviation 57.1 and 57.3), but I have seen it + or - .2 (e.g. tuned charge = 57.2; deviation 57.0 and 57.4). Even of just recently with 4 different rifle loads tuned, stepping out of the tuned load +- .3 or more not only opend the group, but for a couple of rifles, opened the group significantly more than 1".</p><p> </p><p>..but ... I have found one exception to this experience result. If the bullet seating is "on or into the lands", for some reason the groups barely if any changed even out at 200+ yards. Again with my experience, the powder charge can be modified by even by as much as 1.5+ grains and the groups stayed almost the same. </p><p> </p><p>I understand Mikecr mentioned one expert found that even a "kernel" deviation made a difference ...but I am going to side with this discernment --></p><p> </p><p>"...small internal variations in individual case volume, differences in individual primer heat, even changes in the ambient temp on powder burn rate produces more potential velocity variation than truly tiny powder charge differences."</p><p> </p><p><strong><u>not to forget the personality of every single rifle</u></strong> </p><p> </p><p>Just a thought: Stereo makers make stereo equipment that have specs that a human ear cannot hear ever; but they charge you for it "because it is there". </p><p> </p><p>So use your own discernment but make sure you aren't drinking some kool-aid. There are some kool-aid makers out there that will next try to sell us "kernel" splitters.</p></blockquote><p></p>
[QUOTE="338winmag, post: 534163, member: 29912"] Some very good points in this thread. I recently purchased the RCBS CM 1500 scale\dispenser. Mikecr has the CM discernment down perfectly. [U][B]Drifting[/B][/U] - I have seen a +.2 or +.3 drifting a few times if I walk away and come back 30 minutes later. I have also seen it hold perfectly for longer times so this is just one thing to take into consideration. [U][B]Avalanche kernel fall[/B][/U] - yup.. I see this happen on occasion. I modify by either dumping the load and redispensing or I remove a kernel or two and re-weigh to make the load useable. [B][U]Customized settings [/U][/B]-some neat things can be done to one's custom liking. Just make sure you "know" what you are really doing. [B][U]The straw thing[/U][/B] - I have to research that a bit more. [B][U]More Accurate Scales[/U][/B] - Reviewing my reloading practices and results, I believe Boomtube has a very clear understanding if there is a need for a scale more precise. In my reloading experience I also have found there is a "window or range of margin" within the tuned powder charge. That window is almost always + or - .1 (e.g. tuned charge = 57.2; deviation 57.1 and 57.3), but I have seen it + or - .2 (e.g. tuned charge = 57.2; deviation 57.0 and 57.4). Even of just recently with 4 different rifle loads tuned, stepping out of the tuned load +- .3 or more not only opend the group, but for a couple of rifles, opened the group significantly more than 1". ..but ... I have found one exception to this experience result. If the bullet seating is "on or into the lands", for some reason the groups barely if any changed even out at 200+ yards. Again with my experience, the powder charge can be modified by even by as much as 1.5+ grains and the groups stayed almost the same. I understand Mikecr mentioned one expert found that even a "kernel" deviation made a difference ...but I am going to side with this discernment --> "...small internal variations in individual case volume, differences in individual primer heat, even changes in the ambient temp on powder burn rate produces more potential velocity variation than truly tiny powder charge differences." [B][U]not to forget the personality of every single rifle[/U][/B] Just a thought: Stereo makers make stereo equipment that have specs that a human ear cannot hear ever; but they charge you for it "because it is there". So use your own discernment but make sure you aren't drinking some kool-aid. There are some kool-aid makers out there that will next try to sell us "kernel" splitters. [/QUOTE]
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