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Rifles, Reloading, Optics, Equipment
Gunsmithing
Lug setback? What am I missing?
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<blockquote data-quote="Canadian Bushman" data-source="post: 1821101" data-attributes="member: 41122"><p>Larger bolt face exerts more bolt thrust. Cohunt has it right.</p><p></p><p>This is why Kirby Allen for years tried to talk people out of building lapua boltface cartridges on .700 dia bolts. The barrel tennon dia also should really be brought up to 1.125 as well.</p><p></p><p>This is also why Shawn Carlock developed the 338 edge for factory remington actions and developed his terminator actions for the bigger boltface.</p><p></p><p>A particular quality of hardened steel is the harder it gets the closer the yield strength and tensile strength get to each other.</p><p></p><p>So in a sense, by the time the lugs set back enough for you to notice, they have already yielded. Once they yield, failure isnt far off. </p><p></p><p>With the big lapua boltface, the difference between safe operating pressures, and those that are high enough to yield the lugs can be as easy as a slight layer of oil left in the chamber or switching to a new lot of powder. So its really not a good idea to build a 338 lapua on an action with a 700 bolt.</p><p></p><p>PS. As the bolt dia increases in scale with the rest of the action. I.E. barrel tennon, lug dia, lug width etc.The action becomes significantly stronger with even a small increase in diameter.</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 1821101, member: 41122"] Larger bolt face exerts more bolt thrust. Cohunt has it right. This is why Kirby Allen for years tried to talk people out of building lapua boltface cartridges on .700 dia bolts. The barrel tennon dia also should really be brought up to 1.125 as well. This is also why Shawn Carlock developed the 338 edge for factory remington actions and developed his terminator actions for the bigger boltface. A particular quality of hardened steel is the harder it gets the closer the yield strength and tensile strength get to each other. So in a sense, by the time the lugs set back enough for you to notice, they have already yielded. Once they yield, failure isnt far off. With the big lapua boltface, the difference between safe operating pressures, and those that are high enough to yield the lugs can be as easy as a slight layer of oil left in the chamber or switching to a new lot of powder. So its really not a good idea to build a 338 lapua on an action with a 700 bolt. PS. As the bolt dia increases in scale with the rest of the action. I.E. barrel tennon, lug dia, lug width etc.The action becomes significantly stronger with even a small increase in diameter. [/QUOTE]
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Lug setback? What am I missing?
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