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Rifles, Reloading, Optics, Equipment
Gunsmithing
Lug setback? What am I missing?
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<blockquote data-quote="Alex Wheeler" data-source="post: 1824157" data-attributes="member: 101859"><p>6br with a 55 grain bullet vs a 30-06 with 200 grain bullet. Taking chamber wall grip out of it, both will show equal bolt thrust and stiff bolt lift at the same pressure. But obviously will have large differences in recoil. </p><p>Stiff bolt lift can be caused by temporary lug setback. The bolt and lug seats compress enough to allow the case brass to yield. With actions that have larger lug seats you may never experience stiff bolt lift. With these actions we have to measure case head expansion because they dont have that temporary lug setback and you will drop a primer out of the case before getting a stiff bolt.</p></blockquote><p></p>
[QUOTE="Alex Wheeler, post: 1824157, member: 101859"] 6br with a 55 grain bullet vs a 30-06 with 200 grain bullet. Taking chamber wall grip out of it, both will show equal bolt thrust and stiff bolt lift at the same pressure. But obviously will have large differences in recoil. Stiff bolt lift can be caused by temporary lug setback. The bolt and lug seats compress enough to allow the case brass to yield. With actions that have larger lug seats you may never experience stiff bolt lift. With these actions we have to measure case head expansion because they dont have that temporary lug setback and you will drop a primer out of the case before getting a stiff bolt. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Lug setback? What am I missing?
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