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Rifle assembly
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<blockquote data-quote="Black Diamond 408" data-source="post: 148342" data-attributes="member: 1563"><p>There are things called harmonics in barrels, if your thread fit is not "almost perfect" varing vibrations will develop, one wants the rifle to vibrate the same all the time. Even if the face of the reciever and bbl shank are square, there will or could be underlying vibrations. Not to mention if the threads are cut to about 50% contact, there can be some mis alinement in chamber to action bore, this can cause loss in accuracy, hence the reason for blue printing, remember we are talking very minor adjustments. We are also talking about serious stresses being imposed on the threads and the locking lug abutments from the chamber pressures, 60,000# will have a big effect on the threads, the better the contact in threaded area will reduce bad vibrations. The only way to achieve good thread contact is have a action that is threaded perfectly and match the bbl to the threads. No prethreaded bbl will perfectly match a action, unless you get lucky, its never happened to me.</p><p></p><p>Pinned barrels, maybe on a low pressure case???? High pressure rounds, most everything will shoot is a high pressure case, 45,000# and on up. Eventully the bbl will start to move or shear off the pins, leaving a very dangerous situation.</p><p></p><p>Heated and pressed on, how would you know if its pressed on straight? With an interferance fit, there is still metal to metal contact. We measure bbl to action alignment in the "tens of thousands" or tenths...if would work, it would of allready been done. A quality set of threads is the way to go, you need a good gunsmith to achieve this, he has to have patience along the way. You cant rush putting on a bbl.</p><p></p><p>Just my .02</p><p></p><p>Dave</p></blockquote><p></p>
[QUOTE="Black Diamond 408, post: 148342, member: 1563"] There are things called harmonics in barrels, if your thread fit is not "almost perfect" varing vibrations will develop, one wants the rifle to vibrate the same all the time. Even if the face of the reciever and bbl shank are square, there will or could be underlying vibrations. Not to mention if the threads are cut to about 50% contact, there can be some mis alinement in chamber to action bore, this can cause loss in accuracy, hence the reason for blue printing, remember we are talking very minor adjustments. We are also talking about serious stresses being imposed on the threads and the locking lug abutments from the chamber pressures, 60,000# will have a big effect on the threads, the better the contact in threaded area will reduce bad vibrations. The only way to achieve good thread contact is have a action that is threaded perfectly and match the bbl to the threads. No prethreaded bbl will perfectly match a action, unless you get lucky, its never happened to me. Pinned barrels, maybe on a low pressure case???? High pressure rounds, most everything will shoot is a high pressure case, 45,000# and on up. Eventully the bbl will start to move or shear off the pins, leaving a very dangerous situation. Heated and pressed on, how would you know if its pressed on straight? With an interferance fit, there is still metal to metal contact. We measure bbl to action alignment in the "tens of thousands" or tenths...if would work, it would of allready been done. A quality set of threads is the way to go, you need a good gunsmith to achieve this, he has to have patience along the way. You cant rush putting on a bbl. Just my .02 Dave [/QUOTE]
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