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Rifles, Reloading, Optics, Equipment
Gunsmithing
Gunsmithing Lathe
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<blockquote data-quote="Centre Punch" data-source="post: 676816" data-attributes="member: 3048"><p>I recently re-barreled my 22-250 to 22BR and my shooting buddies 1:9 twist 223 to a 1:12 twist .223 AI.</p><p>This time both barrels were done using the through the headstock method and later shortened to the required length on the steady.</p><p>I made a 4 point spider to fit on the rear of the spindle and with my modified 4 jaw chuck and PTG ranging rods the bore was set up for the mearest flicker on the .0001" clock.</p><p></p><p>After finishing the tennon and thread i used a new method to me of chambering.</p><p>The chamber was rough drilled about .125" shallow and the bore once again indicated to almost zero, then using a home made HSS boring bar the chamber was turned to .015" under finished diametre for about an inch of depth.</p><p>This totally concentric bore then guides the finish reamer rather then relying on the pilot of the reamer to do all the work.</p><p></p><p>This results in a chamber with zero run out between it and the threads and is only governed to how accurately the bore is indicated.</p><p>I am not going to say it is a more accurate way of chambering a barrel but IMO it is less fraut with complications which could occur by guiding the reamer by the pilot alone.</p><p></p><p>Ian.</p></blockquote><p></p>
[QUOTE="Centre Punch, post: 676816, member: 3048"] I recently re-barreled my 22-250 to 22BR and my shooting buddies 1:9 twist 223 to a 1:12 twist .223 AI. This time both barrels were done using the through the headstock method and later shortened to the required length on the steady. I made a 4 point spider to fit on the rear of the spindle and with my modified 4 jaw chuck and PTG ranging rods the bore was set up for the mearest flicker on the .0001" clock. After finishing the tennon and thread i used a new method to me of chambering. The chamber was rough drilled about .125" shallow and the bore once again indicated to almost zero, then using a home made HSS boring bar the chamber was turned to .015" under finished diametre for about an inch of depth. This totally concentric bore then guides the finish reamer rather then relying on the pilot of the reamer to do all the work. This results in a chamber with zero run out between it and the threads and is only governed to how accurately the bore is indicated. I am not going to say it is a more accurate way of chambering a barrel but IMO it is less fraut with complications which could occur by guiding the reamer by the pilot alone. Ian. [/QUOTE]
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