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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="Salmotrutta" data-source="post: 2443193" data-attributes="member: 110250"><p>I have to admit it wasn't my idea. That came from the ballistician at western and was identified as the primary variable they used to tune QL and then verified the results via pressure barrel. The logic from them was that there are so many variables in chamber dimensions, throating, primer type etc. That can affect the models result that are not explicit variables, that the easiest way to account for those was to adjust case volume. Shot start/initiation pressure was useful to to adjust the model for bullet jump, bullet dimensions, hardness, etc.</p><p></p><p>By adjusting the Ba you are in affect influencing the model as well. To me it is useful to modify case volumes as I can easily see how far off of reality I am flexing my model (for me 5% is too far) and leads me to validate all my other input to make sure I don't have an error somewhere else. If I tweek a variable like Ba, I don't have context for it, and I think it's possible to "turn that dial" so far that you might cover up other errors w/o realizing it. It's just my process, not saying it's any better that anyone else's. I just tried to be clear on what I do, and where it came from.</p><p></p><p>I haven't tried your seating depth rule, but it sounds like a good place to start. I would assume that different bullets and throating greatly effect this.</p></blockquote><p></p>
[QUOTE="Salmotrutta, post: 2443193, member: 110250"] I have to admit it wasn't my idea. That came from the ballistician at western and was identified as the primary variable they used to tune QL and then verified the results via pressure barrel. The logic from them was that there are so many variables in chamber dimensions, throating, primer type etc. That can affect the models result that are not explicit variables, that the easiest way to account for those was to adjust case volume. Shot start/initiation pressure was useful to to adjust the model for bullet jump, bullet dimensions, hardness, etc. By adjusting the Ba you are in affect influencing the model as well. To me it is useful to modify case volumes as I can easily see how far off of reality I am flexing my model (for me 5% is too far) and leads me to validate all my other input to make sure I don't have an error somewhere else. If I tweek a variable like Ba, I don't have context for it, and I think it's possible to "turn that dial" so far that you might cover up other errors w/o realizing it. It's just my process, not saying it's any better that anyone else's. I just tried to be clear on what I do, and where it came from. I haven't tried your seating depth rule, but it sounds like a good place to start. I would assume that different bullets and throating greatly effect this. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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QuickLOAD way off from reality. Solutions?
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