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Rifles, Reloading, Optics, Equipment
Gunsmithing
Lug setback? What am I missing?
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<blockquote data-quote="MNbogboy" data-source="post: 1821562" data-attributes="member: 18849"><p>The force on the lugs always dependent on the chamber pressure and the size of the back of the chamber ( explained by JE Custom as piston size ).</p><p></p><p>Recoil is a different force dependant on the weight of the bullet and it's speed in a reaction to the weight of the rifle where thrust in each direction is equalized.</p><p>(For every force there is an equal and opposite reaction).</p><p></p><p>A 55 grain bullet at 60000 psi will create far less recoil than a 300 grain bullet at 60000 psi in the same rifle. Look at the muzzle energy of both.</p><p>But the forces on the lugs and abutments will be the same with both bullets at 60000 psi.</p><p></p><p> The larger the rear of the chamber diameter is the more static force is applied to the lugs & abutments. Because of the law Force = pressure x area. </p><p></p><p>The big diameter Lapua, Norma and Weatherby magnums require the stronger lugs & abutments because of their diameters.</p><p></p><p>Randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1821562, member: 18849"] The force on the lugs always dependent on the chamber pressure and the size of the back of the chamber ( explained by JE Custom as piston size ). Recoil is a different force dependant on the weight of the bullet and it's speed in a reaction to the weight of the rifle where thrust in each direction is equalized. (For every force there is an equal and opposite reaction). A 55 grain bullet at 60000 psi will create far less recoil than a 300 grain bullet at 60000 psi in the same rifle. Look at the muzzle energy of both. But the forces on the lugs and abutments will be the same with both bullets at 60000 psi. The larger the rear of the chamber diameter is the more static force is applied to the lugs & abutments. Because of the law Force = pressure x area. The big diameter Lapua, Norma and Weatherby magnums require the stronger lugs & abutments because of their diameters. Randy [/QUOTE]
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Lug setback? What am I missing?
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