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Rifles, Reloading, Optics, Equipment
Gunsmithing
When checking bolt-lug face surface % with a sharpie...
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<blockquote data-quote="Susquatch" data-source="post: 1643612" data-attributes="member: 31264"><p>I'm not sure what that means.....</p><p></p><p>One interpretation might be the equivalent of Borden bumps where the bolt diameter is less than the raceway diameter and has a lot of slop as it slides back and forth. This slop disappears when the bolt is rotated into position because the "bumps" which were in the lug raceway now bear on the main shaft raceway to eliminate all clearance. Note that the Browning X-Bolt uses plastic guides on the bolt shaft to achieve a similar result. Borden is very aggressive about protecting his patents and I find the results kind of ugly so I prefer to install a new bolt with a fitted shaft clearance of 2 to 3 thou.</p><p></p><p>Another interpretation might be what is usually called bolt nose clearance. This is the gap between the bolt nose and the barrel tenon in the fully closed position. I could never endorse zero clearance in this dimension. You always need a little clearance for dirt or carbon fouling and even temperature expansion, and a bit more clearance for hunting rifles where cycling the bolt is mission critical.</p><p></p><p>Each to his own.</p></blockquote><p></p>
[QUOTE="Susquatch, post: 1643612, member: 31264"] I'm not sure what that means..... One interpretation might be the equivalent of Borden bumps where the bolt diameter is less than the raceway diameter and has a lot of slop as it slides back and forth. This slop disappears when the bolt is rotated into position because the "bumps" which were in the lug raceway now bear on the main shaft raceway to eliminate all clearance. Note that the Browning X-Bolt uses plastic guides on the bolt shaft to achieve a similar result. Borden is very aggressive about protecting his patents and I find the results kind of ugly so I prefer to install a new bolt with a fitted shaft clearance of 2 to 3 thou. Another interpretation might be what is usually called bolt nose clearance. This is the gap between the bolt nose and the barrel tenon in the fully closed position. I could never endorse zero clearance in this dimension. You always need a little clearance for dirt or carbon fouling and even temperature expansion, and a bit more clearance for hunting rifles where cycling the bolt is mission critical. Each to his own. [/QUOTE]
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When checking bolt-lug face surface % with a sharpie...
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