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Rifles, Reloading, Optics, Equipment
Gunsmithing
Firing Pin Protrusion
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<blockquote data-quote="Edd" data-source="post: 1457027" data-attributes="member: 30592"><p><a href="http://www.dtic.mil/dtic/tr/fulltext/u2/a114616.pdf" target="_blank">http://www.dtic.mil/dtic/tr/fulltext/u2/a114616.pdf</a></p><p></p><p>2.4.3 Primer Cup Indentation - Any discussion of firing pin design is not</p><p></p><p>complete without mentioning primer cup indentation. Uncontrolled indentation</p><p></p><p>can lead to penetration of the primer cup, which results is some back-venting</p><p></p><p>of the primer as it functions. On the other hand, too small an indentation</p><p></p><p>may not adequately collapse the cup against the priming composition and the</p><p></p><p>anvil, resulting in a no-fire. It has been found that a depth of .020 to .025</p><p></p><p>inches should be considered ideal for small diameter (pistol type) primers,</p><p></p><p>while a figure of .025 to .030 inches should be used for large rifle type</p><p></p><p>primers. Although lower indentations may be acceptable, a minimum of .012 inches should be observed with conventional firing mechanisms, since anything</p><p></p><p>less is a "light blow" and may be the cause of a malfunction.</p></blockquote><p></p>
[QUOTE="Edd, post: 1457027, member: 30592"] [URL]http://www.dtic.mil/dtic/tr/fulltext/u2/a114616.pdf[/URL] 2.4.3 Primer Cup Indentation - Any discussion of firing pin design is not complete without mentioning primer cup indentation. Uncontrolled indentation can lead to penetration of the primer cup, which results is some back-venting of the primer as it functions. On the other hand, too small an indentation may not adequately collapse the cup against the priming composition and the anvil, resulting in a no-fire. It has been found that a depth of .020 to .025 inches should be considered ideal for small diameter (pistol type) primers, while a figure of .025 to .030 inches should be used for large rifle type primers. Although lower indentations may be acceptable, a minimum of .012 inches should be observed with conventional firing mechanisms, since anything less is a "light blow" and may be the cause of a malfunction. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Firing Pin Protrusion
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