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Rifles, Reloading, Optics, Equipment
Reloading
QL assistance
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<blockquote data-quote="Petey308" data-source="post: 2605008" data-attributes="member: 106845"><p>There are too many unaccounted for variables with QL and I've seen actual velocities compared to estimates, even with specific COAL, case length, barrel length, water capacity of the case, etc still be off more than 100fps. </p><p></p><p>The number you typically tweak to calibrate QL to your actual MV is the powder burn rate (Ba). That's the linear variable that works better than anything else to true the results it spits out regarding velocity and pressure. </p><p></p><p>It's not that the powder burn rate isn't what is loaded in QL, it's that differences in ignition rate based on the primers you're using, moisture content of the powder, ambient temperature, shoulder bump, neck tension, bore area, bullet jump to lands, etc, etc will essentially alter the rate the powder burns from point of ignition to point the bullet exits the barrel. </p><p></p><p>So trying to get accurate MV estimates with QL without a chronograph can be futile. You'll get lucky at best.</p></blockquote><p></p>
[QUOTE="Petey308, post: 2605008, member: 106845"] There are too many unaccounted for variables with QL and I’ve seen actual velocities compared to estimates, even with specific COAL, case length, barrel length, water capacity of the case, etc still be off more than 100fps. The number you typically tweak to calibrate QL to your actual MV is the powder burn rate (Ba). That’s the linear variable that works better than anything else to true the results it spits out regarding velocity and pressure. It’s not that the powder burn rate isn’t what is loaded in QL, it’s that differences in ignition rate based on the primers you’re using, moisture content of the powder, ambient temperature, shoulder bump, neck tension, bore area, bullet jump to lands, etc, etc will essentially alter the rate the powder burns from point of ignition to point the bullet exits the barrel. So trying to get accurate MV estimates with QL without a chronograph can be futile. You’ll get lucky at best. [/QUOTE]
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