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Rifles, Reloading, Optics, Equipment
Gunsmithing
Lug setback? What am I missing?
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<blockquote data-quote="Mram10us" data-source="post: 1820256" data-attributes="member: 111667"><p>A member brought up reading about lug setback from Kirby Allen. He explained that a lapua sized boltface :</p><p>1. Doesn't show signs of over pressure till it's too late because of tougher brass and what I would assume would be the more area on the case head to absorb</p><p>2. the lugs feel MORE energy due to the bigger boltface</p><p></p><p>The first one, I will agree, makes a bit of sense since it's a bigger surface area, however, the ejector is still the same size. The second makes ZERO sense to me. What does boltface size have to do with lugs and lug abatements? The rearward force on the bolt should be the same regardless of bolt face size since the bolt lugs and abatements are the same size. What am I missing?</p></blockquote><p></p>
[QUOTE="Mram10us, post: 1820256, member: 111667"] A member brought up reading about lug setback from Kirby Allen. He explained that a lapua sized boltface : 1. Doesn’t show signs of over pressure till it’s too late because of tougher brass and what I would assume would be the more area on the case head to absorb 2. the lugs feel MORE energy due to the bigger boltface The first one, I will agree, makes a bit of sense since it’s a bigger surface area, however, the ejector is still the same size. The second makes ZERO sense to me. What does boltface size have to do with lugs and lug abatements? The rearward force on the bolt should be the same regardless of bolt face size since the bolt lugs and abatements are the same size. What am I missing? [/QUOTE]
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Lug setback? What am I missing?
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