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Rifles, Reloading, Optics, Equipment
Reloading
How nonsense becomes fact.
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<blockquote data-quote="fiftybmg" data-source="post: 1903637" data-attributes="member: 96316"><p>I was reading up on 30-06 AI, and came across an article on Shootingtimes.com , <a href="https://www.shootingtimes.com/editorial/handloading-the-30-06-ackley-improved/372483" target="_blank">30-06 AI reloads</a> .</p><p></p><p>In there the writer describes his journey to producing reloads, and ends with</p><p></p><p>"... I used the usual pressure indicators of primer appearance and bolt lift to estimate how safe the "hotter" handload recipes were ..."</p><p></p><p>Usual since when, and by whom.</p><p></p><p>There is an example of a respected publication spouting often repeated nonsense, that people who don't know better about will assume is the right way to find the limit on hot handloads.</p><p></p><p>Imagine - "I can't understand why, I added one grain of powder at a time, and the bolt lifted easily each time till everything suddenly blew up ."</p><p></p><p>There is a way to find the optimum load for your rifle, that could improve on factory data, but that is not it. He measured velocity, but was comparing it to nothing known. The point of recording velocity is to check it against the known limit.</p><p></p><p>The writer ends with "Coincidentally, the Speer Reloading Manual #4 (circa 1960) includes recipes for the .30-06 AI, and the maximum velocity listed exactly matches my results." </p><p></p><p>So, by sheer dumb luck, the "feel" and the "look" gave the matching result to a measured proof barrel. At least he's lucky.</p><p></p><p>This is an example of when nonsense is repeated often enough, it becomes generally accepted fact. You cannot determine pressure change by looking at or feeling metal. It requires physical measurement.</p><p></p><p>The correct approach is to first find reputable data, and work up the load. If there is no data, there is software nowdays to estimate for you. But not to keep adding powder while checking how the primer looks and how the bolt feels.</p></blockquote><p></p>
[QUOTE="fiftybmg, post: 1903637, member: 96316"] I was reading up on 30-06 AI, and came across an article on Shootingtimes.com , [URL='https://www.shootingtimes.com/editorial/handloading-the-30-06-ackley-improved/372483']30-06 AI reloads[/URL] . In there the writer describes his journey to producing reloads, and ends with "... I used the usual pressure indicators of primer appearance and bolt lift to estimate how safe the “hotter” handload recipes were ..." Usual since when, and by whom. There is an example of a respected publication spouting often repeated nonsense, that people who don't know better about will assume is the right way to find the limit on hot handloads. Imagine - "I can't understand why, I added one grain of powder at a time, and the bolt lifted easily each time till everything suddenly blew up ." There is a way to find the optimum load for your rifle, that could improve on factory data, but that is not it. He measured velocity, but was comparing it to nothing known. The point of recording velocity is to check it against the known limit. The writer ends with "Coincidentally, the Speer Reloading Manual #4 (circa 1960) includes recipes for the .30-06 AI, and the maximum velocity listed exactly matches my results." So, by sheer dumb luck, the "feel" and the "look" gave the matching result to a measured proof barrel. At least he's lucky. This is an example of when nonsense is repeated often enough, it becomes generally accepted fact. You cannot determine pressure change by looking at or feeling metal. It requires physical measurement. The correct approach is to first find reputable data, and work up the load. If there is no data, there is software nowdays to estimate for you. But not to keep adding powder while checking how the primer looks and how the bolt feels. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How nonsense becomes fact.
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