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Rifles, Reloading, Optics, Equipment
Gunsmithing
HEADSPACE GAUGES QUESTION
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<blockquote data-quote="J E Custom" data-source="post: 1455581" data-attributes="member: 2736"><p>The go gauges are .220 minimum and .227 maximum. ammo/brass manufactures are required to stay within these dimensions. That being said, some are in the middle of these dimensions and some are at the extreme limits (Maximum length of .227 and may not fit in the chamber that is near the minimum.</p><p></p><p>If you use one brand of brass it is prudent to check it at the minimum (.220)and increase the minimum until it will chamber. Don't go over the maximum of .227 though because if you buy brass or ammo that is minimum (.220) you will have to much head space and other problems will show there ugly head.</p><p></p><p>I have had this problem before and found brass that was maximum (.227) + and would not chamber in a chamber with less than max belt head space. This brass was rejected because with the .010 possible head space of the shoulder typical of belted cases before firing( and the .007 at the belt it could be possible to end up with .017 total head space (Not good). If minimum dimension ammo was used.</p><p></p><p>I like to set the minimum head space with the head space go gauge and then test the brass. (most are somewhere in the middle of the minimum and the maximum belt width) then deepen the chamber until it head spaces with .001 clearance on the belt (This is the belt head space with this brass) This will give a maximum possible head space to the shoulder of .011 for the first firing/forming. After that I neck size only as long as it will chamber to minimize the case growth.</p><p></p><p>After this first firing, I can bump the shoulder .001 thousandths and utilize the belt if I want, with a total of .002 head space to the shoulder, or head space off the shoulder with essentially .000 head space for longer case/brass life.</p><p></p><p>Depending on the cartridge no go gauges will normally be .005 to .006 for maximum chamber size/head space and will indicate that if the no go gauge can be closed on, it should be considered marginal.</p><p></p><p>The field gauge is a rejection gauge and if the bolt can close on it, the barrel/chamber should be replaced.</p><p></p><p>I only use go gauges and shim stock to head space so I can get any required head space between the go and the no go gauge. My preferred head space is .0005 to .0015 and can only be achieved/set by using A go gauge and the appropriate shims.</p><p></p><p>Just My recommended method for setting belted case head space and gauge use.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1455581, member: 2736"] The go gauges are .220 minimum and .227 maximum. ammo/brass manufactures are required to stay within these dimensions. That being said, some are in the middle of these dimensions and some are at the extreme limits (Maximum length of .227 and may not fit in the chamber that is near the minimum. If you use one brand of brass it is prudent to check it at the minimum (.220)and increase the minimum until it will chamber. Don't go over the maximum of .227 though because if you buy brass or ammo that is minimum (.220) you will have to much head space and other problems will show there ugly head. I have had this problem before and found brass that was maximum (.227) + and would not chamber in a chamber with less than max belt head space. This brass was rejected because with the .010 possible head space of the shoulder typical of belted cases before firing( and the .007 at the belt it could be possible to end up with .017 total head space (Not good). If minimum dimension ammo was used. I like to set the minimum head space with the head space go gauge and then test the brass. (most are somewhere in the middle of the minimum and the maximum belt width) then deepen the chamber until it head spaces with .001 clearance on the belt (This is the belt head space with this brass) This will give a maximum possible head space to the shoulder of .011 for the first firing/forming. After that I neck size only as long as it will chamber to minimize the case growth. After this first firing, I can bump the shoulder .001 thousandths and utilize the belt if I want, with a total of .002 head space to the shoulder, or head space off the shoulder with essentially .000 head space for longer case/brass life. Depending on the cartridge no go gauges will normally be .005 to .006 for maximum chamber size/head space and will indicate that if the no go gauge can be closed on, it should be considered marginal. The field gauge is a rejection gauge and if the bolt can close on it, the barrel/chamber should be replaced. I only use go gauges and shim stock to head space so I can get any required head space between the go and the no go gauge. My preferred head space is .0005 to .0015 and can only be achieved/set by using A go gauge and the appropriate shims. Just My recommended method for setting belted case head space and gauge use. J E CUSTOM [/QUOTE]
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HEADSPACE GAUGES QUESTION
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