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Rifles, Reloading, Optics, Equipment
Reloading
Accurate Burn Rate chart that compares Hodgden-Alliant-Viht powders
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<blockquote data-quote="MagnumManiac" data-source="post: 2429582" data-attributes="member: 10755"><p>Again, you believe something that is false.</p><p>It is not RELATIVE because no 2 powders from different companies has EVER been tested side by side. They all do their own calorimeter bomb tests and publish THEIR findings. What they do not publish along with that list is which powder they baseless this off. The interesting thing about a calorimeter bomb test is the fact that it isn't a cartridge simulation, it only records heat, pressure and time WITHIN a closed pressure vessel that allows expansion but no exit occurs. It is this RQ number that the burn rate chart is based off.</p><p>This is why a RELATIVE burn rate chart is often not even close and, more often is actually wrong with it's listed relationship groupings.</p><p>For example, in certain bore sizes and cartridge sizes, let's call it Expansion Ratio, many powders switch their burn rates on the list. In the 338WM, RE19 gives the higher velocities with 210g-225g bullets over slower powders because the volume is perfectly matched to the pressure reached, while RE22 lags behind until you get to 250g bullets and heavier. Same happens in certain cartridges with Varget and H4350.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2429582, member: 10755"] Again, you believe something that is false. It is not RELATIVE because no 2 powders from different companies has EVER been tested side by side. They all do their own calorimeter bomb tests and publish THEIR findings. What they do not publish along with that list is which powder they baseless this off. The interesting thing about a calorimeter bomb test is the fact that it isn’t a cartridge simulation, it only records heat, pressure and time WITHIN a closed pressure vessel that allows expansion but no exit occurs. It is this RQ number that the burn rate chart is based off. This is why a RELATIVE burn rate chart is often not even close and, more often is actually wrong with it’s listed relationship groupings. For example, in certain bore sizes and cartridge sizes, let’s call it Expansion Ratio, many powders switch their burn rates on the list. In the 338WM, RE19 gives the higher velocities with 210g-225g bullets over slower powders because the volume is perfectly matched to the pressure reached, while RE22 lags behind until you get to 250g bullets and heavier. Same happens in certain cartridges with Varget and H4350. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Accurate Burn Rate chart that compares Hodgden-Alliant-Viht powders
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