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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 Dakota- FiftyDriver and others-
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<blockquote data-quote="Fiftydriver" data-source="post: 63184" data-attributes="member: 10"><p>Daveosok,</p><p></p><p>Yes I use a cobalt drill that is 0.030" under sized of the chamber shoulder diameter to clean out the bulk of the barrel steel.</p><p></p><p>I take 0.300" cuts with the drill and then ream that section out with the chambering reamer, then dripp another 0.300" then ream, then drill then ream, etc...</p><p></p><p>This way, the live pilot on my chambering reamer which is fitted to within 0.0002" of the bore diameter always has full length baring contact with the bore and the chamber will be cut perfectly true to teh axis of the bore and most of the wear and tear is placed on the drill instead of the expensive reamer.</p><p></p><p>Others will order in roughing reamers but these are much more expensive then a drill bit and there is no advantage to the finished chamber at all.</p><p></p><p>I have watched so called smiths take a drill bit and hog out the entire length of the chamber body and then come in with a reamer and finish it up. This is a VERY BAD chambering method and the reamer will follow the drill path instead of being aligned with the axis of the bore. Drills do not cut in a straight line either so the chamber will never be a quality chamber using this method.</p><p></p><p>Taking short bulking drill cuts followed by cleaning that section up with a live piloted reamer is the best system I have used or studied so far.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 63184, member: 10"] Daveosok, Yes I use a cobalt drill that is 0.030" under sized of the chamber shoulder diameter to clean out the bulk of the barrel steel. I take 0.300" cuts with the drill and then ream that section out with the chambering reamer, then dripp another 0.300" then ream, then drill then ream, etc... This way, the live pilot on my chambering reamer which is fitted to within 0.0002" of the bore diameter always has full length baring contact with the bore and the chamber will be cut perfectly true to teh axis of the bore and most of the wear and tear is placed on the drill instead of the expensive reamer. Others will order in roughing reamers but these are much more expensive then a drill bit and there is no advantage to the finished chamber at all. I have watched so called smiths take a drill bit and hog out the entire length of the chamber body and then come in with a reamer and finish it up. This is a VERY BAD chambering method and the reamer will follow the drill path instead of being aligned with the axis of the bore. Drills do not cut in a straight line either so the chamber will never be a quality chamber using this method. Taking short bulking drill cuts followed by cleaning that section up with a live piloted reamer is the best system I have used or studied so far. Good Shooting!! Kirby Allen(50) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 Dakota- FiftyDriver and others-
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