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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Long range weatherby guys
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<blockquote data-quote="sable tireur" data-source="post: 1209054" data-attributes="member: 27307"><p>Weatherby Accuracy</p><p></p><p></p><p> I honestly don't have the time to write the dissertation it would take to answer all the questions you raise. However, I can address some of the questions regarding the actions, accuracy enhancements and accuracy in general.</p><p></p><p></p><p> Mark V barrel threads are 1-1/16-16, UNA – 3A</p><p></p><p></p><p> This thread form is exactly the same as the Remington M700 thread form. Why there is a problem accurizing this Weatherby thread, I'll never understand? Most of us have a fixture or method of holding the action in a lathe so that we can single point the threads with a minimal truing cut. This cut is based on using the center of the action as a true bore line or zero. The action can be faced and the threads trued in one set up. The only thing left out is truing the lug seats which in this case number too many to attack by cutting. These are generally left for lapping. Rarely, if ever, do all nine (or 6) lugs mate exactly. </p><p></p><p></p><p></p><p>REF:</p><p> [FONT=&quot]The bolt diameter for the Mark V 9 lug bolt is .842.[/FONT]</p><p> [FONT=&quot]The bolt diameter for the Mark V® 6 lug bolt is .706.[/FONT]</p><p>[FONT=&quot]</p><p>[/FONT]</p><p> [FONT=&quot]The bolt is placed in the lathe and a face truing cut is made.[/FONT]</p><p>[FONT=&quot]</p><p>[/FONT]</p><p> [FONT=&quot]There aren't any mysteries regarding how accurate barrels are made. There are several makers who know the process and maintain strict manufacturing processes to insure that each barrel meets their standards. We choose one of those and then proceed to set it up properly then thread the tenon and cut the chamber. The trick here is that reamers are usually ground to one of two standards, SAAMI or custom. A gunsmith cannot be expected to have all the variations available for one cartridge since the price of a single reamer is fast approaching $200.00/each. Generally we keep a SAAMI spec reamer on hand and use separate reamers for the throat and neck if required. A gunsmith who has a specialty in say benchrest cartridges, may have specialized reamers which are used more frequently than SAAMI reamers. </p><p>[/FONT]</p><p>[FONT=&quot]</p><p>[/FONT]</p><p> [FONT=&quot]In this situation a dummy cartridge (or 3) is required to cut the throat and freebore (leade). Herein lies the problem, you have to pick the bullet or bullets you want to shoot in order to get the proper throat and leade cut. These bullets need to be approximately the same length and shape. But if the barrel is one of the very best and straight and the gunsmith does his job properly, a straight chamber in a straight barrel should shoot most bullets accurately.[/FONT]</p><p>[FONT=&quot]</p><p>[/FONT]</p><p> [FONT=&quot]In essence there shouldn't be any problem getting your barrel replaced with one of vastly better quality if you pay attention to getting a best barrel and a qualified gunsmith. Weatherby states flat out that they will only guarantee 1-1/2" for the larger cartridges in the smaller diameter barrels. Skip matching the factory contour and step up in diameter and taper thereby allowing for the potential of better accuracy. This will usually require a new stock which will allow for a larger diameter barrel.[/FONT]</p><p>[FONT=&quot]</p><p>[/FONT]</p><p> [FONT=&quot]I've left out a ton of information and answers but this will get you started.[/FONT]</p><p></p><p>[FONT=&quot][/FONT]</p><p>[FONT=&quot]Regards.</p><p>[/FONT]</p></blockquote><p></p>
[QUOTE="sable tireur, post: 1209054, member: 27307"] Weatherby Accuracy I honestly don’t have the time to write the dissertation it would take to answer all the questions you raise. However, I can address some of the questions regarding the actions, accuracy enhancements and accuracy in general. Mark V barrel threads are 1-1/16-16, UNA – 3A This thread form is exactly the same as the Remington M700 thread form. Why there is a problem accurizing this Weatherby thread, I’ll never understand? Most of us have a fixture or method of holding the action in a lathe so that we can single point the threads with a minimal truing cut. This cut is based on using the center of the action as a true bore line or zero. The action can be faced and the threads trued in one set up. The only thing left out is truing the lug seats which in this case number too many to attack by cutting. These are generally left for lapping. Rarely, if ever, do all nine (or 6) lugs mate exactly. REF: [FONT="]The bolt diameter for the Mark V 9 lug bolt is .842.[/FONT] [FONT="]The bolt diameter for the Mark V® 6 lug bolt is .706.[/FONT] [FONT="] [/FONT] [FONT="]The bolt is placed in the lathe and a face truing cut is made.[/FONT] [FONT="] [/FONT] [FONT="]There aren’t any mysteries regarding how accurate barrels are made. There are several makers who know the process and maintain strict manufacturing processes to insure that each barrel meets their standards. We choose one of those and then proceed to set it up properly then thread the tenon and cut the chamber. The trick here is that reamers are usually ground to one of two standards, SAAMI or custom. A gunsmith cannot be expected to have all the variations available for one cartridge since the price of a single reamer is fast approaching $200.00/each. Generally we keep a SAAMI spec reamer on hand and use separate reamers for the throat and neck if required. A gunsmith who has a specialty in say benchrest cartridges, may have specialized reamers which are used more frequently than SAAMI reamers. [/FONT] [FONT="] [/FONT] [FONT="]In this situation a dummy cartridge (or 3) is required to cut the throat and freebore (leade). Herein lies the problem, you have to pick the bullet or bullets you want to shoot in order to get the proper throat and leade cut. These bullets need to be approximately the same length and shape. But if the barrel is one of the very best and straight and the gunsmith does his job properly, a straight chamber in a straight barrel should shoot most bullets accurately.[/FONT] [FONT="] [/FONT] [FONT="]In essence there shouldn’t be any problem getting your barrel replaced with one of vastly better quality if you pay attention to getting a best barrel and a qualified gunsmith. Weatherby states flat out that they will only guarantee 1-1/2” for the larger cartridges in the smaller diameter barrels. Skip matching the factory contour and step up in diameter and taper thereby allowing for the potential of better accuracy. This will usually require a new stock which will allow for a larger diameter barrel.[/FONT] [FONT="] [/FONT] [FONT="]I’ve left out a ton of information and answers but this will get you started.[/FONT] [FONT="][/FONT] [FONT="]Regards. [/FONT] [/QUOTE]
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