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Rifles, Reloading, Optics, Equipment
Reloading
Even neck tension
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<blockquote data-quote="Bart B" data-source="post: 500000" data-attributes="member: 5302"><p>Kevin's right about expander balls.</p><p></p><p>I got a bunch of .311 caliber expander balls then polished 'em down to .3080" up through .3090" in .0002" steps. Using several regular RCBS full length sizing dies with their necks lapped out to .332" to .338" in .001" steps, I could tackle all sorts of .308 Win. cases to hold 30 caliber match bullets ranging from .3082" to .3092" with the tension I wanted when case neck wall thickness for each lot/batch of cases had its own dimension. Used a die whos neck diameter was anywhere from 1 to 4 thousandths smaller than a loaded round's neck diameter with an expander ball to just barely "uniform" the case mouth diameter. Bullet runout using this process was under 2 thousandths; great for accuracy.</p><p></p><p>The key to this set of tools and their use is case mouths aren't sized down and expanded up more than necessary. Necks stay straighter and don't get work hardened and brittle. Cases last longer. .308 Win. cases could be reloaded several dozen times this way and never need their necks annealed.</p></blockquote><p></p>
[QUOTE="Bart B, post: 500000, member: 5302"] Kevin's right about expander balls. I got a bunch of .311 caliber expander balls then polished 'em down to .3080" up through .3090" in .0002" steps. Using several regular RCBS full length sizing dies with their necks lapped out to .332" to .338" in .001" steps, I could tackle all sorts of .308 Win. cases to hold 30 caliber match bullets ranging from .3082" to .3092" with the tension I wanted when case neck wall thickness for each lot/batch of cases had its own dimension. Used a die whos neck diameter was anywhere from 1 to 4 thousandths smaller than a loaded round's neck diameter with an expander ball to just barely "uniform" the case mouth diameter. Bullet runout using this process was under 2 thousandths; great for accuracy. The key to this set of tools and their use is case mouths aren't sized down and expanded up more than necessary. Necks stay straighter and don't get work hardened and brittle. Cases last longer. .308 Win. cases could be reloaded several dozen times this way and never need their necks annealed. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Even neck tension
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