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Rifles, Reloading, Optics, Equipment
Reloading
Brass splitting at neck/shoulder. Lots of pics.
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<blockquote data-quote="Bullet bumper" data-source="post: 861086" data-attributes="member: 17844"><p>Do you dry lube the inside and outside of the neck ?</p><p>Could ammonia from bore solvents be contaminating the case necks ?</p><p>Do you leave you ammo loaded for long periods of time ?</p><p> </p><p>My thinking is that the brass was work hardened from the factory , it could have sat around for years getting harder before sale and the die system is adding extra work hardening , reducing friction helps , plus high neck tension may be adding to stress corrosion in the brass over time , </p><p>Brass quality could be low and impurities in the brass could be helping cracks start . If the neck is too hard then expansion from firing will make cracking more likely . </p><p>If any ammonia is contacting the brass in any process that also speeds up stress corrosion cracking. Look up , " stress corrosion in brass " .</p><p>I am not sure what dies are available for the 30-378 but if you can't buy a body die I would be making one by cutting the head off a Full Length sizing die and drilling the neck out to just over the neck diameter of a loaded round. </p><p>Then if you can't buy a Lee collet die for it I would try and modify one from a similar 30 cal cartridge . You don't have to size the full length of the neck and collet dies can be adjusted as to where they size with a washer over the case on the shell holder. </p><p>That should not happen after only 3 reloads so there is more than one thing going on here.</p></blockquote><p></p>
[QUOTE="Bullet bumper, post: 861086, member: 17844"] Do you dry lube the inside and outside of the neck ? Could ammonia from bore solvents be contaminating the case necks ? Do you leave you ammo loaded for long periods of time ? My thinking is that the brass was work hardened from the factory , it could have sat around for years getting harder before sale and the die system is adding extra work hardening , reducing friction helps , plus high neck tension may be adding to stress corrosion in the brass over time , Brass quality could be low and impurities in the brass could be helping cracks start . If the neck is too hard then expansion from firing will make cracking more likely . If any ammonia is contacting the brass in any process that also speeds up stress corrosion cracking. Look up , " stress corrosion in brass " . I am not sure what dies are available for the 30-378 but if you can't buy a body die I would be making one by cutting the head off a Full Length sizing die and drilling the neck out to just over the neck diameter of a loaded round. Then if you can't buy a Lee collet die for it I would try and modify one from a similar 30 cal cartridge . You don't have to size the full length of the neck and collet dies can be adjusted as to where they size with a washer over the case on the shell holder. That should not happen after only 3 reloads so there is more than one thing going on here. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Brass splitting at neck/shoulder. Lots of pics.
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