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Rifles, Reloading, Optics, Equipment
Reloading
burn rate charts
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<blockquote data-quote="MagnumManiac" data-source="post: 1151547" data-attributes="member: 10755"><p>The reason you see differing charge weights in comparison between powders in different cartridges is because burn rate is not constant. It changes as expansion ratio and case shape changes. A perfect example is how straight wall cartridges and those with little shoulder make fast powders burn like slower powders, some powders even swap position in certain case sizes. A perfect example is the 338WM and RE19 and RE22. RE19 behaves slower than RE22 in this case, producing higher velocity at the same pressure.</p><p>This is why burn charts are not reliable, just because a certain powder behaves a certain way when tested in a calorimeter bomb, does NOT mean it will behave the same in EVERY cartridge design it is used in.</p><p></p><p>Cheers.</p><p>lightbulb</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1151547, member: 10755"] The reason you see differing charge weights in comparison between powders in different cartridges is because burn rate is not constant. It changes as expansion ratio and case shape changes. A perfect example is how straight wall cartridges and those with little shoulder make fast powders burn like slower powders, some powders even swap position in certain case sizes. A perfect example is the 338WM and RE19 and RE22. RE19 behaves slower than RE22 in this case, producing higher velocity at the same pressure. This is why burn charts are not reliable, just because a certain powder behaves a certain way when tested in a calorimeter bomb, does NOT mean it will behave the same in EVERY cartridge design it is used in. Cheers. lightbulb [/QUOTE]
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burn rate charts
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