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Rifles, Reloading, Optics, Equipment
Reloading
Making a datum line gauge
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<blockquote data-quote="bigedp51" data-source="post: 1387537" data-attributes="member: 28965"><p>Shoulder bump thumb rule</p><p>Bolt action shoulder bump .001 to .002</p><p>Semi-autos shoulder bump .003 to .006</p><p>Also on a semi-auto the resized diameter should be .003 to .005 smaller in diameter than its fired diameter after sizing. This insures the case will "spring back" from the chamber walls and extract reliably. Most semi-autos and pump actions do not have the same primary extraction that a bolt action has on bolt lift. Meaning the bolt lift is what breaks the case free from the chamber walls and secondary extraction is pulling the bolt straight back.</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1387537, member: 28965"] Shoulder bump thumb rule Bolt action shoulder bump .001 to .002 Semi-autos shoulder bump .003 to .006 Also on a semi-auto the resized diameter should be .003 to .005 smaller in diameter than its fired diameter after sizing. This insures the case will "spring back" from the chamber walls and extract reliably. Most semi-autos and pump actions do not have the same primary extraction that a bolt action has on bolt lift. Meaning the bolt lift is what breaks the case free from the chamber walls and secondary extraction is pulling the bolt straight back. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Making a datum line gauge
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