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Rifles, Reloading, Optics, Equipment
Reloading
Shoulder bumping-HELP
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<blockquote data-quote="bigedp51" data-source="post: 1161893" data-attributes="member: 28965"><p>If you have a hint of ejector mark it means you have brass flow witch means the base of the case may have expanded. You need to measure a new unfired case and one of the problem cases.</p><p></p><p><strong><span style="font-size: 10px">Simple Trick for Monitoring Pressure of Your Rifle Reloads</span></strong></p><p><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></p><p></p><p></p><p>Hard bolt lift indicates the brass is not springing back from the chamber walls, indicating high chamber pressure, and this varies with brass hardness.</p><p></p><p></p><p>We also live in a plus and minus manufacturing world and you may have a small diameter chamber or a large diameter die, or both.</p><p></p><p></p><p>On a semi-auto rifle it is recommended the fired case be .003 to .005 smaller in diameter after full length resizing as an example for reliable extraction. Meaning your die may not be sizing the case small enough in diameter.</p><p></p><p></p><p>You could try pausing at the top of the ram stroke for a few seconds and this will reduce brass spring back after sizing. Or try another resizing die, "BUT" you would be surprised how much dies vary in internal dimensions. I have a Lee .223 full length die that sizes the case smaller in diameter than my RCBS small base die does.</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1161893, member: 28965"] If you have a hint of ejector mark it means you have brass flow witch means the base of the case may have expanded. You need to measure a new unfired case and one of the problem cases. [B][SIZE=2]Simple Trick for Monitoring Pressure of Your Rifle Reloads[/SIZE][/B] [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] Hard bolt lift indicates the brass is not springing back from the chamber walls, indicating high chamber pressure, and this varies with brass hardness. We also live in a plus and minus manufacturing world and you may have a small diameter chamber or a large diameter die, or both. On a semi-auto rifle it is recommended the fired case be .003 to .005 smaller in diameter after full length resizing as an example for reliable extraction. Meaning your die may not be sizing the case small enough in diameter. You could try pausing at the top of the ram stroke for a few seconds and this will reduce brass spring back after sizing. Or try another resizing die, "BUT" you would be surprised how much dies vary in internal dimensions. I have a Lee .223 full length die that sizes the case smaller in diameter than my RCBS small base die does. [/QUOTE]
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Shoulder bumping-HELP
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