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Rifles, Reloading, Optics, Equipment
Gunsmithing
Lug setback? What am I missing?
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<blockquote data-quote="Will Gray" data-source="post: 1821070" data-attributes="member: 65116"><p>Think of the brass as a piston. The area of the brass (above the belt if belted: the area of the chamber) is the area of a piston to which the pressure in the chamber is applied. That area times the maximum pressure in the chamber yields the force on the bolt. The area and strength of the lugs (both on the bolt and in the action) must be large enough and of such material that the lugs are not damaged by even a gross overpressure in the cylinder. Good design would dictate an action several times stronger than the force of maximum loads. Shock loads are rough on steel so the action must be made of tough (not case hardened or brittle steel). I do not have the numbers but can be assured that creditable commercial gun manufacturers can tell you the kind of steel and hardness needed for safe actions.</p></blockquote><p></p>
[QUOTE="Will Gray, post: 1821070, member: 65116"] Think of the brass as a piston. The area of the brass (above the belt if belted: the area of the chamber) is the area of a piston to which the pressure in the chamber is applied. That area times the maximum pressure in the chamber yields the force on the bolt. The area and strength of the lugs (both on the bolt and in the action) must be large enough and of such material that the lugs are not damaged by even a gross overpressure in the cylinder. Good design would dictate an action several times stronger than the force of maximum loads. Shock loads are rough on steel so the action must be made of tough (not case hardened or brittle steel). I do not have the numbers but can be assured that creditable commercial gun manufacturers can tell you the kind of steel and hardness needed for safe actions. [/QUOTE]
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Lug setback? What am I missing?
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