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Rifles, Reloading, Optics, Equipment
Reloading
case welding?
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<blockquote data-quote="eddybo" data-source="post: 165673" data-attributes="member: 7194"><p>I tried BBs experiment with some .300wbys I had loaded last year, but took it one step further. I found that the bullets were definately harder to move than freshly loaded rounds. I also found that they shoot to almost but not quite the same point of impact at 725 yards. I wish that I was using the same lot of powder and primers and bullets so I could say for certian that these did not account for the 1/2 MOA point of impact shift. There are just too many variables to say whether the galvanic response of the two metals was the cause of the shift. </p><p>"Galvanic Response" learned that word on benchrest central. I think it means that two similar metals under compression will bond if corroded. I think it is a real and not a myth, but probably not of much consequence. If you went out and checked your drop chart with newly loaded rounds and didnt confirm it for a year, could this reaction cause an impact shift when you shoot the bullets a year later? I do not know the answer, but do know that inconsistant neck tension can cause groups to suffer. That is basically what would happen if you mixed last years rounds with this years fresh reloads, the neck tension will differ. </p><p>Based on the bit of research that I have done I do not think that "cold welding" between the bullet and case would be dangerous, but do think that if you mixed old rounds with new rounds it may cause some slight accuracy problems. Maybe someone could determine if this is a real concern by shooting some old reloads with some fresh ones using matching lot numbered componants. I havent shot much at 1k, but they say that extended range everything comes into play, could this be one of those things?</p></blockquote><p></p>
[QUOTE="eddybo, post: 165673, member: 7194"] I tried BBs experiment with some .300wbys I had loaded last year, but took it one step further. I found that the bullets were definately harder to move than freshly loaded rounds. I also found that they shoot to almost but not quite the same point of impact at 725 yards. I wish that I was using the same lot of powder and primers and bullets so I could say for certian that these did not account for the 1/2 MOA point of impact shift. There are just too many variables to say whether the galvanic response of the two metals was the cause of the shift. "Galvanic Response" learned that word on benchrest central. I think it means that two similar metals under compression will bond if corroded. I think it is a real and not a myth, but probably not of much consequence. If you went out and checked your drop chart with newly loaded rounds and didnt confirm it for a year, could this reaction cause an impact shift when you shoot the bullets a year later? I do not know the answer, but do know that inconsistant neck tension can cause groups to suffer. That is basically what would happen if you mixed last years rounds with this years fresh reloads, the neck tension will differ. Based on the bit of research that I have done I do not think that "cold welding" between the bullet and case would be dangerous, but do think that if you mixed old rounds with new rounds it may cause some slight accuracy problems. Maybe someone could determine if this is a real concern by shooting some old reloads with some fresh ones using matching lot numbered componants. I havent shot much at 1k, but they say that extended range everything comes into play, could this be one of those things? [/QUOTE]
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Reloading
case welding?
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