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Rifles, Reloading, Optics, Equipment
Reloading
Advice on what's going wrong with my load!?
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<blockquote data-quote="MNbogboy" data-source="post: 789620" data-attributes="member: 18849"><p>Was this last Decembers loads or new ones?</p><p>Sitting for even a month or two often "cold welding" can occur between the bullet and case mouth...Thought to be caused by "Galvanic" action of two disimilar metals where the molecules of one material migrate to the other and intertwine for lack of more scientific terms...</p><p> </p><p>Whatever the cause of this "cold welding" causes the value of neck tension to increase dramatically and may affect your loads but not always the case...</p><p> </p><p>If these are new loads with any component change (i.e. same bullets but from a different lot or same powder but a new can)....These changes can make lots of difference...For instance Berger replaced the dies for my 6.5 140 VLDs...The base to ogive measurement moved over .015 thousanths and the diameter actually dropped a full 1/2 thousandth.....Length increased an average of about .030.....Result whole new bullet as far as I am concerned...My pet loads at .045 off really soured and when all was said and done now I am at .010 off.....</p><p> </p><p>I doubt that the drop in temp only 17 degrees should make that big a difference but a rise in temp by that amount can put you over the top if you are at max at the lower temp....</p><p> </p><p>Just a couple of thoughts,</p><p>randy</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 789620, member: 18849"] Was this last Decembers loads or new ones? Sitting for even a month or two often "cold welding" can occur between the bullet and case mouth...Thought to be caused by "Galvanic" action of two disimilar metals where the molecules of one material migrate to the other and intertwine for lack of more scientific terms... Whatever the cause of this "cold welding" causes the value of neck tension to increase dramatically and may affect your loads but not always the case... If these are new loads with any component change (i.e. same bullets but from a different lot or same powder but a new can)....These changes can make lots of difference...For instance Berger replaced the dies for my 6.5 140 VLDs...The base to ogive measurement moved over .015 thousanths and the diameter actually dropped a full 1/2 thousandth.....Length increased an average of about .030.....Result whole new bullet as far as I am concerned...My pet loads at .045 off really soured and when all was said and done now I am at .010 off..... I doubt that the drop in temp only 17 degrees should make that big a difference but a rise in temp by that amount can put you over the top if you are at max at the lower temp.... Just a couple of thoughts, randy [/QUOTE]
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Reloading
Advice on what's going wrong with my load!?
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