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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
A twist on barrel break in question...... Bullet seating depth....
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<blockquote data-quote="J E Custom" data-source="post: 1438986" data-attributes="member: 2736"><p>When I chamber a barrel. I first find out what spindle speed that Reamer likes best By trying different spindle speeds from 40 to 105 as the shoulder and body starts to cut. This tells me what speed the reamer cuts best at. then as I make cuts the reamer tells me when it starts to load up with chips and I reduce the feed depth to less feed depth as I go.</p><p></p><p>The deeper you go, the sooner the reamer loads up and constant reduction in depth of cut is necessary. Depending on the size and sharpness of the reamer, by the time I get within several hundred thousandths, I am down to .020 to .030 thousandths a cut and cleaning</p><p>the reamer and chamber between cuts. (A little slow, but worth the time.) normally the last few cuts are around .010 deep and a finish cut for head space is .005 + with a clean reamer and chamber.</p><p></p><p>This gives the total chamber including the throat, neck, and lead a very smooth finish that has no machine marks that need any special treatment.</p><p></p><p>I also use a high pressure grease on the reamer pilot to prevent it from marking the lands (It actually prevents metal to metal contact of the pilot and the lands, much like the oil in an engine prevents the crankshaft from touching the bearings ).</p><p></p><p>Most, if not all of the machine marks in a barrel are from the drilling operation. Premium barrels are first drilled, then reamed, and then laped to remove all of these marks/flaws. A well cut chamber will/should not add any defects to the part that is cut with a good reamer and a good chambering procedure.</p><p></p><p>I inspect all of my finished barrels with a borescope to verify its finish.</p><p>Although it is not the same as the lapped finish it has no machine marks and should not need any further processes other than breakin. The chamber should have a satin finish with no anular marks and needs no polishing if done right In My Opinion.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1438986, member: 2736"] When I chamber a barrel. I first find out what spindle speed that Reamer likes best By trying different spindle speeds from 40 to 105 as the shoulder and body starts to cut. This tells me what speed the reamer cuts best at. then as I make cuts the reamer tells me when it starts to load up with chips and I reduce the feed depth to less feed depth as I go. The deeper you go, the sooner the reamer loads up and constant reduction in depth of cut is necessary. Depending on the size and sharpness of the reamer, by the time I get within several hundred thousandths, I am down to .020 to .030 thousandths a cut and cleaning the reamer and chamber between cuts. (A little slow, but worth the time.) normally the last few cuts are around .010 deep and a finish cut for head space is .005 + with a clean reamer and chamber. This gives the total chamber including the throat, neck, and lead a very smooth finish that has no machine marks that need any special treatment. I also use a high pressure grease on the reamer pilot to prevent it from marking the lands (It actually prevents metal to metal contact of the pilot and the lands, much like the oil in an engine prevents the crankshaft from touching the bearings ). Most, if not all of the machine marks in a barrel are from the drilling operation. Premium barrels are first drilled, then reamed, and then laped to remove all of these marks/flaws. A well cut chamber will/should not add any defects to the part that is cut with a good reamer and a good chambering procedure. I inspect all of my finished barrels with a borescope to verify its finish. Although it is not the same as the lapped finish it has no machine marks and should not need any further processes other than breakin. The chamber should have a satin finish with no anular marks and needs no polishing if done right In My Opinion. J E CUSTOM [/QUOTE]
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A twist on barrel break in question...... Bullet seating depth....
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