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Rifles, Reloading, Optics, Equipment
Reloading
Measuring OAL in precision ammo...
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<blockquote data-quote="richardca99" data-source="post: 779196" data-attributes="member: 31022"><p>I'd like to hear your thougths on why the threaded die/press vs. arbor press would contribute to the error...I hadn't thought about that.</p><p></p><p>I think I'm starting to get my head around this. Reading an article by German Salazar yesterday helped a bit, though I just had my "ah ha" moment while reading this post. </p><p></p><p>I had thought -- though I couldn't really get my head around the "why" -- that if the seating plug contacted every bullet at a fixed radius (regardless of where that radius is along the length of a bullet), then variance should just get pushed into the case during the seating process (or left out, as the case may be). In other words, a good die ought to be able to produce loaded round after loaded round with the plug contact point the same distance from the case head. </p><p></p><p>That's all true. The trouble is, the variance that we care about is the variance in the distance from the SEATING PLUG contact point to the COMPARATOR contact point (ogive). Salazar (who ought to know) says that measuring base-to-ogive, base-to-tip, or any other dimension isn't going to tell you squat about this measurement. You'd have to measure seating-plug-contact-point-to-ogive on every bullet, and there isn't a tool to do this. The only way to seat every bullet the same is to seat every bullet individually measure each as you "walk it down."</p></blockquote><p></p>
[QUOTE="richardca99, post: 779196, member: 31022"] I'd like to hear your thougths on why the threaded die/press vs. arbor press would contribute to the error...I hadn't thought about that. I think I'm starting to get my head around this. Reading an article by German Salazar yesterday helped a bit, though I just had my "ah ha" moment while reading this post. I had thought -- though I couldn't really get my head around the "why" -- that if the seating plug contacted every bullet at a fixed radius (regardless of where that radius is along the length of a bullet), then variance should just get pushed into the case during the seating process (or left out, as the case may be). In other words, a good die ought to be able to produce loaded round after loaded round with the plug contact point the same distance from the case head. That's all true. The trouble is, the variance that we care about is the variance in the distance from the SEATING PLUG contact point to the COMPARATOR contact point (ogive). Salazar (who ought to know) says that measuring base-to-ogive, base-to-tip, or any other dimension isn't going to tell you squat about this measurement. You'd have to measure seating-plug-contact-point-to-ogive on every bullet, and there isn't a tool to do this. The only way to seat every bullet the same is to seat every bullet individually measure each as you "walk it down." [/QUOTE]
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Measuring OAL in precision ammo...
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