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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: 1824110" data-attributes="member: 101859"><p>The math is staight forward, in theory. But the chamber walls actually help a lot, (dont believe it? oil a case and you will get a lot more bolt thrust) and we also are talking about the pressure vessel, not the od of the case head. So its tough to calculate exactly how much thrust the bolt face sees. But if you just compare it in the simplest form, its psi multiplied by the area of the inside of the case head. Large diameter cases like the Normas and lapuas produce considerably more bolt thrust. Lug set back is something I am very concerned about with these cases and I only use actions with increase lug seat surface area. Its the seat area that resists setback (not length) if the rest of the action is up to it. Think fat tires on sand.</p></blockquote><p></p>
[QUOTE="Alex Wheeler, post: 1824110, member: 101859"] The math is staight forward, in theory. But the chamber walls actually help a lot, (dont believe it? oil a case and you will get a lot more bolt thrust) and we also are talking about the pressure vessel, not the od of the case head. So its tough to calculate exactly how much thrust the bolt face sees. But if you just compare it in the simplest form, its psi multiplied by the area of the inside of the case head. Large diameter cases like the Normas and lapuas produce considerably more bolt thrust. Lug set back is something I am very concerned about with these cases and I only use actions with increase lug seat surface area. Its the seat area that resists setback (not length) if the rest of the action is up to it. Think fat tires on sand. [/QUOTE]
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Lug setback? What am I missing?
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