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Rifles, Reloading, Optics, Equipment
Gunsmithing
7 STW with tight/minimum headspace
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<blockquote data-quote="MNbogboy" data-source="post: 1556941" data-attributes="member: 18849"><p>If the belt to bolt is tight only a dimensional change in the brass or a physical change in the firearm can loosen this (reaming deeper/thinner recoil lug etc.).</p><p>Even lug lapping can help this condition.</p><p>This will result with longer fired cases also and sizing die must be adjusted accordingly.</p><p></p><p>The second scenario is that the chamber is too short from shoulder to bolt head. If the belt is not interfering, then the shoulder must travel farther into the die to "bump" the shoulder back farther. This can be cured by shortening the die or shell holder. Or running the chamber reamer in a hair deeper.</p><p></p><p>Third possibility is that the chamber is "fat" causing extra expansion that the die doesn't resize (caused by springback in the brass). This may be cured by using another die (small base) or by simply switching to another lot or brand of brass.</p><p></p><p>If the shim under the case head experiment doesn't prove anything.</p><p>A double check that the recess in the chamber for the case belt is free of any debris/chips that could interfere with chambering might be the simple answer.</p><p></p><p>Hope you can solve it.</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1556941, member: 18849"] If the belt to bolt is tight only a dimensional change in the brass or a physical change in the firearm can loosen this (reaming deeper/thinner recoil lug etc.). Even lug lapping can help this condition. This will result with longer fired cases also and sizing die must be adjusted accordingly. The second scenario is that the chamber is too short from shoulder to bolt head. If the belt is not interfering, then the shoulder must travel farther into the die to "bump" the shoulder back farther. This can be cured by shortening the die or shell holder. Or running the chamber reamer in a hair deeper. Third possibility is that the chamber is "fat" causing extra expansion that the die doesn't resize (caused by springback in the brass). This may be cured by using another die (small base) or by simply switching to another lot or brand of brass. If the shim under the case head experiment doesn't prove anything. A double check that the recess in the chamber for the case belt is free of any debris/chips that could interfere with chambering might be the simple answer. Hope you can solve it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
7 STW with tight/minimum headspace
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