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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Testing the 135gr Apex-Outdoors Afterburners
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<blockquote data-quote="Petey308" data-source="post: 2612401" data-attributes="member: 106845"><p>I agree. There's a plethora of variables not accounted for in QL. Things just like you mentioned, primers used (and thus initial ignition and peak chamber pressures), shoulder bump, neck tension, free bore length, bullet jump to lands, type of rifling, etc, etc all are not calculated in the mix. </p><p></p><p>So without calibrating QL to actual velocities with a particular load, it's only ever going to be close at best. Without calibrating QL, it's kind of useless really on load development other than comparing case fills with a particular bullet and other load specs, and comparing other powders with all else being equal (like I've done here), and it's also useful for telling you a most likely safe starting load. </p><p></p><p>I've found very accurate methods to calibrate QL though after getting actual velocities and thus allow subsequent result data to be quite accurate with a particular powder and same load specs. It spits out a much more accurate pressure and barrel time. That can then be used to find potential OBT nodes very effectively with minimal components and shots fired after that. That's the next course of action with my testing- to get actual velocities and then calibrate QL for that powder, bullet, and other load specs/dimensions. </p><p></p><p>I wish I already had a Pressure Trace 2 setup, so I could use that to actually find node potential on the initial shots, and not have to add steps, but I'll work with what I have for now.</p></blockquote><p></p>
[QUOTE="Petey308, post: 2612401, member: 106845"] I agree. There’s a plethora of variables not accounted for in QL. Things just like you mentioned, primers used (and thus initial ignition and peak chamber pressures), shoulder bump, neck tension, free bore length, bullet jump to lands, type of rifling, etc, etc all are not calculated in the mix. So without calibrating QL to actual velocities with a particular load, it’s only ever going to be close at best. Without calibrating QL, it’s kind of useless really on load development other than comparing case fills with a particular bullet and other load specs, and comparing other powders with all else being equal (like I’ve done here), and it’s also useful for telling you a most likely safe starting load. I’ve found very accurate methods to calibrate QL though after getting actual velocities and thus allow subsequent result data to be quite accurate with a particular powder and same load specs. It spits out a much more accurate pressure and barrel time. That can then be used to find potential OBT nodes very effectively with minimal components and shots fired after that. That’s the next course of action with my testing- to get actual velocities and then calibrate QL for that powder, bullet, and other load specs/dimensions. I wish I already had a Pressure Trace 2 setup, so I could use that to actually find node potential on the initial shots, and not have to add steps, but I’ll work with what I have for now. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Testing the 135gr Apex-Outdoors Afterburners
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