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Rifles, Reloading, Optics, Equipment
Reloading
Help me understand burn rate
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<blockquote data-quote="del2les" data-source="post: 2043746" data-attributes="member: 9299"><p>Expansion ratio is the case volume plus bore volume, divided by case volume.</p><p></p><p>Example: the case holds 7.3 cubic X and the bore holds 3.1 cubic X. So the expansion ratio for that round in that gun is 10.4/7.3 or 1.42. That would be a very low expansion ratio, indicating use of an extremely slow powder.</p><p></p><p>The general rule on expansion rule is "lower is slower" regarding powder selection. But you can't use it to pick a single best powder, because powders aren't rated by a universal burn speed measurement. You can get only a general idea or "kinda slow" versus "kinda fast" and must experiment after that.</p></blockquote><p></p>
[QUOTE="del2les, post: 2043746, member: 9299"] Expansion ratio is the case volume plus bore volume, divided by case volume. Example: the case holds 7.3 cubic X and the bore holds 3.1 cubic X. So the expansion ratio for that round in that gun is 10.4/7.3 or 1.42. That would be a very low expansion ratio, indicating use of an extremely slow powder. The general rule on expansion rule is "lower is slower" regarding powder selection. But you can't use it to pick a single best powder, because powders aren't rated by a universal burn speed measurement. You can get only a general idea or "kinda slow" versus "kinda fast" and must experiment after that. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Help me understand burn rate
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