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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
QuickLOAD way off from reality. Solutions?
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<blockquote data-quote="Veteran" data-source="post: 2443169" data-attributes="member: 118038"><p>When you match the velocity by tweaking the burn rate, do the back calculation in QL for each velocity of each round you shot. Then back calculate trial and error the Ba that history matches each velocity at different charge weights, then average those back calculated Ba</p><p>numbers to get an average Ba across those velocities. Use that avg. burn rate to forecast your next load.</p><p></p><p>Depending on how many charge weights you go up and the magnitude of each increment you may want to narrow down the range of the data you focus on to do this, because Burn Rate is not constant, using an average Ba you history matched at 87 to 90 gr. of powder probably doesnt work well at 81 to 83 gr of powder. You have to use a Ba that fits best with the data range you want to model.....Also if you do this at 70 degrees F and then go shoot in 95 degrees F guess what?</p><p>It wont work because Ba is not a constant.</p><p></p><p>Be sure to pay close attention to data ranges and temps in the model</p></blockquote><p></p>
[QUOTE="Veteran, post: 2443169, member: 118038"] When you match the velocity by tweaking the burn rate, do the back calculation in QL for each velocity of each round you shot. Then back calculate trial and error the Ba that history matches each velocity at different charge weights, then average those back calculated Ba numbers to get an average Ba across those velocities. Use that avg. burn rate to forecast your next load. Depending on how many charge weights you go up and the magnitude of each increment you may want to narrow down the range of the data you focus on to do this, because Burn Rate is not constant, using an average Ba you history matched at 87 to 90 gr. of powder probably doesnt work well at 81 to 83 gr of powder. You have to use a Ba that fits best with the data range you want to model.....Also if you do this at 70 degrees F and then go shoot in 95 degrees F guess what? It wont work because Ba is not a constant. Be sure to pay close attention to data ranges and temps in the model [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
QuickLOAD way off from reality. Solutions?
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