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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel Blank Curve
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<blockquote data-quote="BillLarson" data-source="post: 2564793" data-attributes="member: 1149"><p>Len,you are correct.... barrel bores are not always perfectly straight..</p><p>First make sure barrel o.d (outside)and i.d (inside) are concentric within .003"</p><p>If they are not identify and mark high spot.</p><p>I set mine up in a set of v-blocks index by hand.A piece of steel/alum.angle will work....you can see less than .005" runout.</p><p>A white background to look at helps.or look at sky..</p><p>Mark high spot.</p><p>this is the way I do it.</p><p>set up in lathe machine receiver threads.</p><p>screw receiver on to see how it is in relation to high spot.</p><p>machine barrel shoulder to time receiver and barrel as desired.</p><p>chamber last to get headspace correct.</p><p>Doing this solves the sometime occurrence of scopes using alot-all of travel to compensate for worm hole bores.</p><p>In theory if bore is straight,receiver,mounts,rings aligned with bore,scope reticle centered,very little ajustment should be needed....</p><p>Hope this helps.... I,m sure I forgot something....</p><p>Let the flames begin....</p><p>bill</p></blockquote><p></p>
[QUOTE="BillLarson, post: 2564793, member: 1149"] Len,you are correct.... barrel bores are not always perfectly straight.. First make sure barrel o.d (outside)and i.d (inside) are concentric within .003" If they are not identify and mark high spot. I set mine up in a set of v-blocks index by hand.A piece of steel/alum.angle will work....you can see less than .005" runout. A white background to look at helps.or look at sky.. Mark high spot. this is the way I do it. set up in lathe machine receiver threads. screw receiver on to see how it is in relation to high spot. machine barrel shoulder to time receiver and barrel as desired. chamber last to get headspace correct. Doing this solves the sometime occurrence of scopes using alot-all of travel to compensate for worm hole bores. In theory if bore is straight,receiver,mounts,rings aligned with bore,scope reticle centered,very little ajustment should be needed.... Hope this helps.... I,m sure I forgot something.... Let the flames begin.... bill [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Barrel Blank Curve
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