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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hand tight switch barrel accuracy?
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<blockquote data-quote="J E Custom" data-source="post: 2004961" data-attributes="member: 2736"><p>It is common to use a torque wrench to tighten barrels and a very accurate way to get consistent performance. Different uses normally call for different torque values. A bench gun that Is not used hard can be as low as 35 ft/lbs. a hunting rifle should be more depending on the quality of the barrel fit and service. The extreme duty rifle should be at minimum 60 ft/lbs to remain constant under all conditions and uses. Some service rifles may have 90+ ft/lbs if they are subject to full automatic fire where there is a lot of heat build up that could cause a shift in parts.</p><p></p><p>The main reason for using a torque wrench is to be consistent. If you work up a load and then allow the torque to change (Even slightly) it will change the harmonics and possibly the POI .</p><p></p><p>Even if the tool is a few pounds off, as long as it is consistent, that is what matters. also the main reason that a torque tool is used is to assure that the torque is the same if a gorilla or a much lighter built person tightens the barrel using the tool, The applied torque will be the same. It is no different than torquing scope base and rings. It is recommended that everyone uses a inch pound torque wrench to prevent over torquing or uneven stress on one screw over the other.</p><p></p><p>I highly recommend using a torque wrench for all threads, to load the part consistently time after time. Especially if you are changing barrels back and forth. you will want the same stress applied to the part for consistent results. Tightening by hand can't give you the consistency, even if indexed because changes in thread fit and lubricants can change the feel and the amount of rotation of the threads. Thread Assembly compounds will help the consistency if used and reduce the needed amount of torque to get the same loading on the threads by an average of 15 %. <img class="smilie smilie--emoji" loading="lazy" alt="👍" title="Thumbs up :thumbsup:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" data-shortname=":thumbsup:" /> <img class="smilie smilie--emoji" loading="lazy" alt="👍" title="Thumbs up :thumbsup:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" data-shortname=":thumbsup:" /></p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 2004961, member: 2736"] It is common to use a torque wrench to tighten barrels and a very accurate way to get consistent performance. Different uses normally call for different torque values. A bench gun that Is not used hard can be as low as 35 ft/lbs. a hunting rifle should be more depending on the quality of the barrel fit and service. The extreme duty rifle should be at minimum 60 ft/lbs to remain constant under all conditions and uses. Some service rifles may have 90+ ft/lbs if they are subject to full automatic fire where there is a lot of heat build up that could cause a shift in parts. The main reason for using a torque wrench is to be consistent. If you work up a load and then allow the torque to change (Even slightly) it will change the harmonics and possibly the POI . Even if the tool is a few pounds off, as long as it is consistent, that is what matters. also the main reason that a torque tool is used is to assure that the torque is the same if a gorilla or a much lighter built person tightens the barrel using the tool, The applied torque will be the same. It is no different than torquing scope base and rings. It is recommended that everyone uses a inch pound torque wrench to prevent over torquing or uneven stress on one screw over the other. I highly recommend using a torque wrench for all threads, to load the part consistently time after time. Especially if you are changing barrels back and forth. you will want the same stress applied to the part for consistent results. Tightening by hand can't give you the consistency, even if indexed because changes in thread fit and lubricants can change the feel and the amount of rotation of the threads. Thread Assembly compounds will help the consistency if used and reduce the needed amount of torque to get the same loading on the threads by an average of 15 %. 👍 👍 J E CUSTOM [/QUOTE]
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Hand tight switch barrel accuracy?
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