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Rifles, Reloading, Optics, Equipment
Reloading
Weighing Powder - How precise is good enough?
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<blockquote data-quote="boomtube" data-source="post: 533677" data-attributes="member: 9215"><p>"..wasn't it Bruce Hogdon that once said that +/- .15 grain is all that matters?"</p><p> </p><p>Don't know about Bruce but that sounds like him. My comment is based on my own observations. Obviously (or it should be) the tolerable variation will depend a lot on the quanity of powder being burned so that changes a bit with case size.</p><p> </p><p>Thing is, ALL powders burn best (that is, most consistantly) within a fairly narrow but easily and clearly identified pressure range. A properly tested and chosen load will have what I call a "window". or tolerance range, within which small variations mean virtually nothing to accuracy - that's why BR shooters rarely bother to weigh charges and sometimes don't even know the weight of their charges. If we take the time to find the full width of that good performing range, typically .3 to .5 gr. for mid-size cartridges, and load in the middle of it small variations won't matter and the frequency of 'unexplained flyers' will diminish. Only when loading on the ragged edge of the window will small variations in the wrong direction cause problems. </p><p> </p><p>IMHO, those who pay big bucks for a Promethus, etc, scale rather than properly developing a good load that's insensitive to tiny variations are wasting big bucks for no good purpose.</p></blockquote><p></p>
[QUOTE="boomtube, post: 533677, member: 9215"] "..wasn't it Bruce Hogdon that once said that +/- .15 grain is all that matters?" Don't know about Bruce but that sounds like him. My comment is based on my own observations. Obviously (or it should be) the tolerable variation will depend a lot on the quanity of powder being burned so that changes a bit with case size. Thing is, ALL powders burn best (that is, most consistantly) within a fairly narrow but easily and clearly identified pressure range. A properly tested and chosen load will have what I call a "window". or tolerance range, within which small variations mean virtually nothing to accuracy - that's why BR shooters rarely bother to weigh charges and sometimes don't even know the weight of their charges. If we take the time to find the full width of that good performing range, typically .3 to .5 gr. for mid-size cartridges, and load in the middle of it small variations won't matter and the frequency of 'unexplained flyers' will diminish. Only when loading on the ragged edge of the window will small variations in the wrong direction cause problems. IMHO, those who pay big bucks for a Promethus, etc, scale rather than properly developing a good load that's insensitive to tiny variations are wasting big bucks for no good purpose. [/QUOTE]
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Reloading
Weighing Powder - How precise is good enough?
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