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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="TommyBreaux" data-source="post: 2444323" data-attributes="member: 51951"><p>Let me say I am NOT a Quickload expert by any stretch of the imagination but I do enjoy using it and Gordon's Reloading Tools.</p><p>Let me also say that I don't use Quickload to try to get the maximum velocity out of any cartridge that I load. I use it to try to get the optimal barrel time for the gun I am loading for at the time. Usually there is a window for any barrel length and cartridge where the lowest integer barrel time node with the highest velocity will be above the maximum pressure for the cartridge. Loading to the next higher half node or whole node will usually produce the best accuracy.</p><p></p><p>The formula I posted earlier in this thread came from a gentleman (?) I met on a Facebook QuickLoad user group several years ago. He said back then that he was writing a book about how to use Quickload with regard to Optimal Barrel Time theory. It hasn't been published yet. Anyway, in Quickload the pull down shows that there is a range for the Weighing Factor from approximately 0.33 for a overbore bottleneck cartridges to 1 for straight wall cartridges. The Quickload default is 0.5, I think this is because the H20 capacities are not specific to your particular cartridge. When applying the formula to most bottleneck cartridges that I load for using an average of 5 to 6 cases for the water capacity I get values that are usually below 0.5. The first thing everyone says is "you can't use the defaults", "you need to measure the water capacity of YOUR cases". If you can measure them why not use them as a constant in the system. As stated earlier the Ba can very from lot to lot but it is provided by the powder manufacturer. So you can either modify the Ba to match your measured velocity of you and alter the starting or initial pressure to match your measured velocity. </p><p></p><p>The gentleman was quick to point out that once you messed with the weighing factor you really couldn't trust the pressures you were getting from Quickload. His belief and I agree is that as long as you aren't exceeding maximum published velocities from a current manual you shouldn't be exceeding the maximum allowable pressure for the cartridge.</p></blockquote><p></p>
[QUOTE="TommyBreaux, post: 2444323, member: 51951"] Let me say I am NOT a Quickload expert by any stretch of the imagination but I do enjoy using it and Gordon's Reloading Tools. Let me also say that I don't use Quickload to try to get the maximum velocity out of any cartridge that I load. I use it to try to get the optimal barrel time for the gun I am loading for at the time. Usually there is a window for any barrel length and cartridge where the lowest integer barrel time node with the highest velocity will be above the maximum pressure for the cartridge. Loading to the next higher half node or whole node will usually produce the best accuracy. The formula I posted earlier in this thread came from a gentleman (?) I met on a Facebook QuickLoad user group several years ago. He said back then that he was writing a book about how to use Quickload with regard to Optimal Barrel Time theory. It hasn't been published yet. Anyway, in Quickload the pull down shows that there is a range for the Weighing Factor from approximately 0.33 for a overbore bottleneck cartridges to 1 for straight wall cartridges. The Quickload default is 0.5, I think this is because the H20 capacities are not specific to your particular cartridge. When applying the formula to most bottleneck cartridges that I load for using an average of 5 to 6 cases for the water capacity I get values that are usually below 0.5. The first thing everyone says is "you can't use the defaults", "you need to measure the water capacity of YOUR cases". If you can measure them why not use them as a constant in the system. As stated earlier the Ba can very from lot to lot but it is provided by the powder manufacturer. So you can either modify the Ba to match your measured velocity of you and alter the starting or initial pressure to match your measured velocity. The gentleman was quick to point out that once you messed with the weighing factor you really couldn't trust the pressures you were getting from Quickload. His belief and I agree is that as long as you aren't exceeding maximum published velocities from a current manual you shouldn't be exceeding the maximum allowable pressure for the cartridge. [/QUOTE]
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QuickLOAD way off from reality. Solutions?
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