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Rifles, Reloading, Optics, Equipment
Reloading
bullet seating accuracy
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<blockquote data-quote="Mikecr" data-source="post: 842338" data-attributes="member: 1521"><p>It isn't that simple, and yet simpler still. </p><p>Throats are cut at whatever angle the reamer provides. It could be from ~.5 to 15degs.</p><p>Bullet noses come in various forms(tangent, secant, hybrid) and radius ~8 to 15degs.</p><p>Various combinations change the contact points of both lands AND noses.</p><p></p><p>You can order your reamer with a throat angle that matches a particular bullet nose.</p><p>You can have a comparator made with the barrel stub and same throating from that reamer at barrel finishing. Only this would provide for true contact datum from a comparator. </p><p>Change bullets and you negate the efforts.</p><p></p><p>But it doesn't matter, as a relative datum is typically what we define while discovering most accurate seating distance -with any particular bullet. You can log it, and as long as you always use the same tool & method of measure, then you can reproduce that best seating distance.</p><p></p><p>I don't pay any mind to where a Sinclair nut contacts w/resp to loaded contact. I'm satisfied as it get's that I can reproduce with the nut whatever I measured with it as best seating.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 842338, member: 1521"] It isn't that simple, and yet simpler still. Throats are cut at whatever angle the reamer provides. It could be from ~.5 to 15degs. Bullet noses come in various forms(tangent, secant, hybrid) and radius ~8 to 15degs. Various combinations change the contact points of both lands AND noses. You can order your reamer with a throat angle that matches a particular bullet nose. You can have a comparator made with the barrel stub and same throating from that reamer at barrel finishing. Only this would provide for true contact datum from a comparator. Change bullets and you negate the efforts. But it doesn't matter, as a relative datum is typically what we define while discovering most accurate seating distance -with any particular bullet. You can log it, and as long as you always use the same tool & method of measure, then you can reproduce that best seating distance. I don't pay any mind to where a Sinclair nut contacts w/resp to loaded contact. I'm satisfied as it get's that I can reproduce with the nut whatever I measured with it as best seating. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
bullet seating accuracy
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