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Rifles, Reloading, Optics, Equipment
Reloading
lose primer pockets, why?
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<blockquote data-quote="bigedp51" data-source="post: 1179097" data-attributes="member: 28965"><p>Brass hardness and how the base is constructed has a great deal to do with how long your primer pockets last. Below are the Rockwell hardness figures for .223/5.56 brass.</p><p></p><p>LC 2008 = 96</p><p> Lapua 223 Match = 86</p><p> Winchester 223 = 69</p><p> Remington "R-P" = 49</p><p></p><p><u><u><u><u><u><u><u><u><a href="http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/" target="_blank">http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/</a></u></u></u></u></u></u></u></u></p><p><u><u></u></u></p><p><u><u></u></u>Below the thickness of the flash hole web in the base of the case adds radial strength and helps keep the base of the case from stretching. The military Lake City case on the right has a much thicker flash hole web than the commercial case on the left. </p><p></p><p><u></u></p><p><u><img src="http://i122.photobucket.com/albums/o254/bigedp51/federal_zpsbp4r0zok.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></u></p><p><u></u></p><p><u></u>Below the thicker flash hole web adds strength to the base of the case. Add this to the hardness of the brass of the Lake City brass and you have a case made Ford Truck Tough. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> As you saw above Lapua has the hardest brass of all commercial cases and is almost as hard as Lake City. </p><p></p><p><u> <img src="http://i122.photobucket.com/albums/o254/bigedp51/webthickness_zps81482a55.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></u></p><p><u></u></p><p><u></u>When your chamber pressure exceeds the elastic limits of the brass the case will stretch in the unsupported base. The base expansion varies with chamber pressure and brass hardness.</p><p><u></u></p><p><u><img src="http://i122.photobucket.com/albums/o254/bigedp51/base%20expanshion_zpss3c0gjcm.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></u></p><p><u></u><span style="font-size: 10px"><strong></strong></span></p><p><span style="font-size: 10px"><strong></strong></span></p><p><span style="font-size: 10px"><strong><u><a href="http://www.hodgdonreloading.com/reloading-education/tips-and-tricks/simple-trick-monitoring-pressure-your-rifle-reloads" target="_blank">Simple Trick for Monitoring Pressure of Your Rifle Reloads | Hodgdon Reloading</a></u></strong></span></p><p><span style="font-size: 10px"><strong></strong></span></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1179097, member: 28965"] Brass hardness and how the base is constructed has a great deal to do with how long your primer pockets last. Below are the Rockwell hardness figures for .223/5.56 brass. LC 2008 = 96 Lapua 223 Match = 86 Winchester 223 = 69 Remington “R-P” = 49 [U][U][U][U][U][U][U][U][URL]http://bulletin.accurateshooter.com/2014/05/how-hard-is-your-brass-5-56-and-223-rem-base-hardness-tests/[/URL][/U][/U][/U][/U][/U][/U] [/U][/U]Below the thickness of the flash hole web in the base of the case adds radial strength and helps keep the base of the case from stretching. The military Lake City case on the right has a much thicker flash hole web than the commercial case on the left. [U] [IMG]http://i122.photobucket.com/albums/o254/bigedp51/federal_zpsbp4r0zok.jpg[/IMG] [/U]Below the thicker flash hole web adds strength to the base of the case. Add this to the hardness of the brass of the Lake City brass and you have a case made Ford Truck Tough. :D As you saw above Lapua has the hardest brass of all commercial cases and is almost as hard as Lake City. [U] [IMG]http://i122.photobucket.com/albums/o254/bigedp51/webthickness_zps81482a55.jpg[/IMG] [/U]When your chamber pressure exceeds the elastic limits of the brass the case will stretch in the unsupported base. The base expansion varies with chamber pressure and brass hardness. [U] [IMG]http://i122.photobucket.com/albums/o254/bigedp51/base%20expanshion_zpss3c0gjcm.png[/IMG] [/U][SIZE=2][B] [U][URL="http://www.hodgdonreloading.com/reloading-education/tips-and-tricks/simple-trick-monitoring-pressure-your-rifle-reloads"]Simple Trick for Monitoring Pressure of Your Rifle Reloads | Hodgdon Reloading[/URL][/U] [/B][/SIZE] [/QUOTE]
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Reloading
lose primer pockets, why?
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