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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder bumping-HELP
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<blockquote data-quote="bigedp51" data-source="post: 1157212" data-attributes="member: 28965"><p>1. You may not be bumping the shoulders back far enough.</p><p>2. When full length resizing pause at the top of the ram stroke for a few seconds. This will reduce brass spring back and make your cartridge headspace more uniform.</p><p>3. Lifting the bolt is primary extraction and should break the case free of the chamber walls. And pulling the bolt handle back should be easy.</p><p>4. If you are having hard bolt lift it may be a sign of high pressure or soft brass. Meaning Lapua brass has the hardest base of all commercial brass.</p><p></p><p>Below as a example .223/5.56 rockwell hardness just above the exactor groove. </p><p></p><p><strong>TEST RESULTS</strong></p><p>Using Rockwell hardness standards (.062″x100kg, Rockwell "B"), the brass measured as follows: <strong></strong></p><p><strong>LC 2008 = 96</strong></p><p><strong> Lapua 223 Match = 86</strong></p><p> <strong>Winchester 223 = 69</strong></p><p> <strong></strong><strong>Remington "R-P" = 49</strong></p><p><strong></strong></p><p><strong><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></strong></p><p><strong></strong> </p><p></p><p>If the problem is pressure related read the link below. Just remember the base expansion is related to how hard the brass is. And Lapua brass would show less expansion than a Remington case at the same chamber pressure. </p><p></p><p><u><u><u><u><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></u></u></u></u></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1157212, member: 28965"] 1. You may not be bumping the shoulders back far enough. 2. When full length resizing pause at the top of the ram stroke for a few seconds. This will reduce brass spring back and make your cartridge headspace more uniform. 3. Lifting the bolt is primary extraction and should break the case free of the chamber walls. And pulling the bolt handle back should be easy. 4. If you are having hard bolt lift it may be a sign of high pressure or soft brass. Meaning Lapua brass has the hardest base of all commercial brass. Below as a example .223/5.56 rockwell hardness just above the exactor groove. [B]TEST RESULTS[/B] Using Rockwell hardness standards (.062″x100kg, Rockwell “B”), the brass measured as follows: [B] LC 2008 = 96[/B] [B] Lapua 223 Match = 86 Winchester 223 = 69 [/B][B]Remington “R-P” = 49 [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] [/B] If the problem is pressure related read the link below. Just remember the base expansion is related to how hard the brass is. And Lapua brass would show less expansion than a Remington case at the same chamber pressure. [U][U][U][U][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][/U][/U][/U][/U] [/QUOTE]
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