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Rifles, Reloading, Optics, Equipment
Reloading
Published Load Data - How Conservative is it?
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<blockquote data-quote="Bart B" data-source="post: 778071" data-attributes="member: 5302"><p>In comparing some "printed" load data's to what SAAMI lists for their specs reveals a lot of differences. Therefore, many of those developing that "printed" load data are measuring both pressure and velocity with a rubber tool.</p><p></p><p>Few sources of published load data uses SAAMI spec barrels and pressure/velocity measuring systems. </p><p></p><p>And the biggest variable is the pressure measuring system. Most of it uses the least accurate system of all; the human eye looking at fired cases with all sorts of structural varaibles they don't know about and the human brain evaluating what it sees. To say nothing about the differences in their barrel compared to that used by the published load source.</p><p></p><p>In second place of variables is the velocity measuring system. A given load will easily have a 100 fps spread across different barrels of the same length. Same spread across several people holding the same rifle to their shoulder shooting the same load.</p></blockquote><p></p>
[QUOTE="Bart B, post: 778071, member: 5302"] In comparing some "printed" load data's to what SAAMI lists for their specs reveals a lot of differences. Therefore, many of those developing that "printed" load data are measuring both pressure and velocity with a rubber tool. Few sources of published load data uses SAAMI spec barrels and pressure/velocity measuring systems. And the biggest variable is the pressure measuring system. Most of it uses the least accurate system of all; the human eye looking at fired cases with all sorts of structural varaibles they don't know about and the human brain evaluating what it sees. To say nothing about the differences in their barrel compared to that used by the published load source. In second place of variables is the velocity measuring system. A given load will easily have a 100 fps spread across different barrels of the same length. Same spread across several people holding the same rifle to their shoulder shooting the same load. [/QUOTE]
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Published Load Data - How Conservative is it?
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