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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338-378 Wby accuracy
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<blockquote data-quote="Fiftydriver" data-source="post: 658916" data-attributes="member: 10"><p>If built properly on a quality receiver, barrel and stock, it should certainly be just as accurate as these other chamberings. The weakest link in the 338-378 Wby is the Wby MkV receiver. Around 10-15% of these simply will not produce 1/2 moa consistancy no matter what you do with them machining wise. This is why I stopped working on them many years ago. That compared to a Rem 700 or custom receiver that I have yet to get one that would not produce 1/2 moa consistancy.</p><p> </p><p>Many people get hung up on a case designs inherent accuracy. That may be true on small capacity 100 and 200 yard BR chamberings. For long range precision using large capacity chamberings and heavy bullets the rifle quality and specs are MUCH more important then the chambering choice.</p><p> </p><p>Throat design is a big factor as well. IF your looking for extreme precision with a 338-378 Wby, you would be wise to go with a shorter, tight speced accuracy throat design instead of the traditional Wby freebore. Freebore is great for velocity, generally not the best for accuracy, at least not in the form Wby does their freebore.</p><p> </p><p>The rifles I have built in 338-378 shot extremely well and were easy to get to shoot 1/2 moa consistancy but they also have accuracy throats and factory ammo would not be safe to shoot in them because factory ammo is designed to be used with the excessive freebore of factory rifles. That said, most that have a full custom rifle built do not generally shoot factory ammo. If a customer does want to shoot factory ammo, I cut the chambers with standard freebore but cut them to a diameter only 1/2 thou over bullet dameter.</p><p> </p><p>In all honesty however, if your choosing a precision chambering, I would not recommend the 338-378 for two reasons, brass is EXTREMELY expensive but worse yet, its generally very soft and will not handle high pressure loading with much case life. This is why chamberings like the 338 Lapua Improved and my 338 Allen Xpress will match the much larger capacity 338-378 Wby in performance and do so with around 8 grains less powder, because the 338 Lapua parent case will support much more chamber pressure and still offer longer case life. Its also much less costly then the Wby brass.</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 658916, member: 10"] If built properly on a quality receiver, barrel and stock, it should certainly be just as accurate as these other chamberings. The weakest link in the 338-378 Wby is the Wby MkV receiver. Around 10-15% of these simply will not produce 1/2 moa consistancy no matter what you do with them machining wise. This is why I stopped working on them many years ago. That compared to a Rem 700 or custom receiver that I have yet to get one that would not produce 1/2 moa consistancy. Many people get hung up on a case designs inherent accuracy. That may be true on small capacity 100 and 200 yard BR chamberings. For long range precision using large capacity chamberings and heavy bullets the rifle quality and specs are MUCH more important then the chambering choice. Throat design is a big factor as well. IF your looking for extreme precision with a 338-378 Wby, you would be wise to go with a shorter, tight speced accuracy throat design instead of the traditional Wby freebore. Freebore is great for velocity, generally not the best for accuracy, at least not in the form Wby does their freebore. The rifles I have built in 338-378 shot extremely well and were easy to get to shoot 1/2 moa consistancy but they also have accuracy throats and factory ammo would not be safe to shoot in them because factory ammo is designed to be used with the excessive freebore of factory rifles. That said, most that have a full custom rifle built do not generally shoot factory ammo. If a customer does want to shoot factory ammo, I cut the chambers with standard freebore but cut them to a diameter only 1/2 thou over bullet dameter. In all honesty however, if your choosing a precision chambering, I would not recommend the 338-378 for two reasons, brass is EXTREMELY expensive but worse yet, its generally very soft and will not handle high pressure loading with much case life. This is why chamberings like the 338 Lapua Improved and my 338 Allen Xpress will match the much larger capacity 338-378 Wby in performance and do so with around 8 grains less powder, because the 338 Lapua parent case will support much more chamber pressure and still offer longer case life. Its also much less costly then the Wby brass. [/QUOTE]
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338-378 Wby accuracy
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