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Rifles, Reloading, Optics, Equipment
Reloading
Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized
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<blockquote data-quote="woods" data-source="post: 646144" data-attributes="member: 6042"><p>Here's someone else who has ACTUALLY DONE A TEST (about 1/2 way down in Shoulder Setback With Reduced Cast Bullet Loads section)</p><p></p><p><a href="http://www.lasc.us/Brennan_6-7_Headspace.htm" target="_blank">Chapter 6.7 On Headspace - Cast Bullets For Beginner And Expert</a></p><p></p><p>some notable excerpts</p><p></p><p>"I have twice fired one case with ~20 oiled - new dead primers in rifles with the extractor removed, and have not yet had the headspace increase. The firing pin didn't drive the case forward."</p><p></p><p>"Some claim that the primer explosion pushes the case forward, driving the shoulder back. The primer and primer pocket act as a piston and cylinder, with the primer gas acting on the forward surface of the primer pocket, around the flash hole."</p><p></p><p>"In my guns, with my tests, it's the primer driving the case forward, not the firing pin."</p><p></p><p></p><p>"It seems that substantial pressure is developed within the primer pocket, which drives the case forward and the primer backwards. The case is stopped by impacting the chamber shoulder, while the primer is stopped by impacting the breech face. Metal deformation results from both impacts: The shoulder of the case is swaged back slightly, and the primer is slightly flattened against the breech."</p><p></p><p>Of course these people may not know what they are talking about either even though they actually did a test.</p><p></p><p>I've seen many other experiences documented through the years but don't have the time to look now</p></blockquote><p></p>
[QUOTE="woods, post: 646144, member: 6042"] Here's someone else who has ACTUALLY DONE A TEST (about 1/2 way down in Shoulder Setback With Reduced Cast Bullet Loads section) [url=http://www.lasc.us/Brennan_6-7_Headspace.htm]Chapter 6.7 On Headspace - Cast Bullets For Beginner And Expert[/url] some notable excerpts "I have twice fired one case with ~20 oiled - new dead primers in rifles with the extractor removed, and have not yet had the headspace increase. The firing pin didn't drive the case forward." "Some claim that the primer explosion pushes the case forward, driving the shoulder back. The primer and primer pocket act as a piston and cylinder, with the primer gas acting on the forward surface of the primer pocket, around the flash hole." "In my guns, with my tests, it's the primer driving the case forward, not the firing pin." "It seems that substantial pressure is developed within the primer pocket, which drives the case forward and the primer backwards. The case is stopped by impacting the chamber shoulder, while the primer is stopped by impacting the breech face. Metal deformation results from both impacts: The shoulder of the case is swaged back slightly, and the primer is slightly flattened against the breech." Of course these people may not know what they are talking about either even though they actually did a test. I've seen many other experiences documented through the years but don't have the time to look now [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized
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