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Rifles, Reloading, Optics, Equipment
Reloading
Case head separation
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<blockquote data-quote="J E Custom" data-source="post: 1296126" data-attributes="member: 2736"><p>Head space is set by the Gunsmith to allow loaded rounds to be chambered. Head space can be anywhere from .000 to .003 thousandths over the SAMME head space go gauge depending on the use and need.</p><p></p><p>Once a round is fired in the chamber only the minimum sizing is recommended for best brass life and loading. Some rifles (Semi Autos) need to be full length sized to function properly. </p><p></p><p>Bumping a shoulder is no different than under sizing a round buy full length sizing in that It increases the effective head space. Bumping the shoulder can cause problems If the Reloader does</p><p>not have a head space gauge or have years of experience. I recommend a minimum sizing no matter which method is used just to get the loaded round to chamber.</p><p></p><p>A Field no go gauge will usually be between .006 and .008 thousandth longer than a go gauge and if the bolt will close on a field (No Go) gauge, It is considered unsafe and has to much head space.</p><p></p><p>Best brass life and accuracy Is obtained with no head space .000 and most accuracy gunsmiths will head space between .0005 and .0015 and depend on the owner to properly size there brass when loading. Factory headspace is normally around .003 to .004 (The maximum recommended) in order to fire all brands of ammo and make chambering easy, With no consideration for brass life and accuracy. (They just want it to function).</p><p></p><p>I don't own a bump die because I have not needed one and fit the sized case to the chamber with </p><p>no bolt slack. (The bolt will close and has no head space). I also do not shoot over pressure loads</p><p>that will require heavy bolt lift for many reasons. Over sizing and working the brass leads to short brass life.</p><p></p><p>Just the way I load.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1296126, member: 2736"] Head space is set by the Gunsmith to allow loaded rounds to be chambered. Head space can be anywhere from .000 to .003 thousandths over the SAMME head space go gauge depending on the use and need. Once a round is fired in the chamber only the minimum sizing is recommended for best brass life and loading. Some rifles (Semi Autos) need to be full length sized to function properly. Bumping a shoulder is no different than under sizing a round buy full length sizing in that It increases the effective head space. Bumping the shoulder can cause problems If the Reloader does not have a head space gauge or have years of experience. I recommend a minimum sizing no matter which method is used just to get the loaded round to chamber. A Field no go gauge will usually be between .006 and .008 thousandth longer than a go gauge and if the bolt will close on a field (No Go) gauge, It is considered unsafe and has to much head space. Best brass life and accuracy Is obtained with no head space .000 and most accuracy gunsmiths will head space between .0005 and .0015 and depend on the owner to properly size there brass when loading. Factory headspace is normally around .003 to .004 (The maximum recommended) in order to fire all brands of ammo and make chambering easy, With no consideration for brass life and accuracy. (They just want it to function). I don't own a bump die because I have not needed one and fit the sized case to the chamber with no bolt slack. (The bolt will close and has no head space). I also do not shoot over pressure loads that will require heavy bolt lift for many reasons. Over sizing and working the brass leads to short brass life. Just the way I load. J E CUSTOM [/QUOTE]
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Case head separation
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