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Rifles, Reloading, Optics, Equipment
Reloading
How much to turn necks?
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<blockquote data-quote="Alan Griffith" data-source="post: 114154" data-attributes="member: 4686"><p>Conclusion on my rifle's neck chamber dimensions: .342"</p><p></p><p>I did a nifty little trick of taking a .350" speer lead ball, jaming it lightly into the mouth of a case and mostly chambering it into the chamber. The neck swaged the .350" ball to .342". Needed a small diameter plastic rod to drive the ball out of the chanbers neck.</p><p></p><p>My math tells me:</p><p></p><p>.342" neck diameter minus .001" spring back = .341"</p><p></p><p>.341" minus .003" clearance = .338"</p><p></p><p>.338" minus .308" bullet diameter = .030"</p><p></p><p>.030" divided by 2 = .015" thickness for each wall.</p><p></p><p>I seem to recall reading stuff over the years that .015" used as a common goal.</p><p></p><p>For now, I'm thinking of just taking the top 27 cases which read the most variance and shaving them down to a max thickness of .0165". This should allow all 100 cases to have a max variance of .0015" or less.</p></blockquote><p></p>
[QUOTE="Alan Griffith, post: 114154, member: 4686"] Conclusion on my rifle's neck chamber dimensions: .342" I did a nifty little trick of taking a .350" speer lead ball, jaming it lightly into the mouth of a case and mostly chambering it into the chamber. The neck swaged the .350" ball to .342". Needed a small diameter plastic rod to drive the ball out of the chanbers neck. My math tells me: .342" neck diameter minus .001" spring back = .341" .341" minus .003" clearance = .338" .338" minus .308" bullet diameter = .030" .030" divided by 2 = .015" thickness for each wall. I seem to recall reading stuff over the years that .015" used as a common goal. For now, I'm thinking of just taking the top 27 cases which read the most variance and shaving them down to a max thickness of .0165". This should allow all 100 cases to have a max variance of .0015" or less. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How much to turn necks?
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