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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel swapping
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<blockquote data-quote="Ray Gross" data-source="post: 2707754" data-attributes="member: 95172"><p>You or may not need separate gages for it. If it is simply a 243 Win necked down to 22 cal, then standard .308 headspace gages are the correct gages.</p><p></p><p>On the other hand, if the 22-243 larjon chamber shoulder has been moved or the shoulder angle changed to something different than the .243 shoulder, then the 'larjon' very likely needs it's own gage. In this situation, the best way to get the proper gages is to have the original reamer print so that the gages can be made to the proper specs. People do use fired brass, but brass is far too malleable to function reliably as a gage.</p><p></p><p>One last thought since these are shoulder barrels; if 1) both of these barrels were chambered and headspaced to this particular action, 2) using the same recoil lug, then you should be able to swap them back and forth to your hearts content without needing gages. The headspace is machined into the fixed barrel shoulder. If the action is not true and square, you may be able to influence the headspace by how tightly you torque it. But the tighter you torque it the shorter the headspace gets, so it potentially could become a function problem, but not a safety problem. If either 1) or 2) are false, then you need gages.</p></blockquote><p></p>
[QUOTE="Ray Gross, post: 2707754, member: 95172"] You or may not need separate gages for it. If it is simply a 243 Win necked down to 22 cal, then standard .308 headspace gages are the correct gages. On the other hand, if the 22-243 larjon chamber shoulder has been moved or the shoulder angle changed to something different than the .243 shoulder, then the 'larjon' very likely needs it's own gage. In this situation, the best way to get the proper gages is to have the original reamer print so that the gages can be made to the proper specs. People do use fired brass, but brass is far too malleable to function reliably as a gage. One last thought since these are shoulder barrels; if 1) both of these barrels were chambered and headspaced to this particular action, 2) using the same recoil lug, then you should be able to swap them back and forth to your hearts content without needing gages. The headspace is machined into the fixed barrel shoulder. If the action is not true and square, you may be able to influence the headspace by how tightly you torque it. But the tighter you torque it the shorter the headspace gets, so it potentially could become a function problem, but not a safety problem. If either 1) or 2) are false, then you need gages. [/QUOTE]
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