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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Updates regarding the Berger .338 Hybrid
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<blockquote data-quote="Augustus" data-source="post: 401539" data-attributes="member: 10142"><p>Gentlemen, I have been following the various post regarding the 300 Berger. The characteristics of these bullets seem to be similar to the long nose solids I have been playing with for the last year or so. The solids that are over 6 cal. in length are extremely sensitive to twist rates and velocity. Since they are solids, deformation and nose slump are pretty well eliminated as factors yet they demonstrate very predictable issues with accuracy and stability as twist rates decrease and velocity increases. As velocity increases the twist rate must also increase to maintain accuracy and stability. This is bass-ackwards from conventional wisdom. </p><p> </p><p>I believe the projos with very long noses which shifts the CG rearward, very quickly become a different breed of cats and take on characteristics unfamiliar to most. The problem with these bullets can be rectified with tighter twist rates. With the banded solid bullets we have the luxury of being able to twist them as tight as necessary to stabilize them. With the jacketed bullets there is a limit on RPMs and at some point one will begin to see spectacular failure in the structure of the bullet. I would like to see someone fire the Bergers out of an 8 twist, if they can stand up to the forces they will be subjected to I would expect them to fly nicely.</p><p> </p><p>Word to the wise. The banded solids also become more stable and more accurate as velocity decreases when fired from a given twist rate. I am almost certian deformation or structural problems are not a factor because if fired at the same velocity but a tighter twist the accuracy and stability magically reappears. </p><p> </p><p>I think someone with access to two barrels one of which is a 9 twist and the other a 10 twist can determine if this bullet is experencing structural failure or is suffering from the long nose syndrome. Simply start at low velocity, slowly increase the velocity of the loads. If you see loss of accuracy from the 10 twist first you are seeing the long nose syndrome if the 9 twist fails first its probably a structural problem. </p><p> </p><p>You guys would be wise not to sweep this post under the mat. The LONG NOSE SYNDROME is alive and well and will affect any projo regardless of its structure if the ratio of nose to body length crosses an undefined line. I suspect the Berger crossed that line.</p></blockquote><p></p>
[QUOTE="Augustus, post: 401539, member: 10142"] Gentlemen, I have been following the various post regarding the 300 Berger. The characteristics of these bullets seem to be similar to the long nose solids I have been playing with for the last year or so. The solids that are over 6 cal. in length are extremely sensitive to twist rates and velocity. Since they are solids, deformation and nose slump are pretty well eliminated as factors yet they demonstrate very predictable issues with accuracy and stability as twist rates decrease and velocity increases. As velocity increases the twist rate must also increase to maintain accuracy and stability. This is bass-ackwards from conventional wisdom. I believe the projos with very long noses which shifts the CG rearward, very quickly become a different breed of cats and take on characteristics unfamiliar to most. The problem with these bullets can be rectified with tighter twist rates. With the banded solid bullets we have the luxury of being able to twist them as tight as necessary to stabilize them. With the jacketed bullets there is a limit on RPMs and at some point one will begin to see spectacular failure in the structure of the bullet. I would like to see someone fire the Bergers out of an 8 twist, if they can stand up to the forces they will be subjected to I would expect them to fly nicely. Word to the wise. The banded solids also become more stable and more accurate as velocity decreases when fired from a given twist rate. I am almost certian deformation or structural problems are not a factor because if fired at the same velocity but a tighter twist the accuracy and stability magically reappears. I think someone with access to two barrels one of which is a 9 twist and the other a 10 twist can determine if this bullet is experencing structural failure or is suffering from the long nose syndrome. Simply start at low velocity, slowly increase the velocity of the loads. If you see loss of accuracy from the 10 twist first you are seeing the long nose syndrome if the 9 twist fails first its probably a structural problem. You guys would be wise not to sweep this post under the mat. The LONG NOSE SYNDROME is alive and well and will affect any projo regardless of its structure if the ratio of nose to body length crosses an undefined line. I suspect the Berger crossed that line. [/QUOTE]
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Updates regarding the Berger .338 Hybrid
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