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Rifles, Reloading, Optics, Equipment
Reloading
Reducing runout suggestion
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<blockquote data-quote="woods" data-source="post: 248551" data-attributes="member: 6042"><p>Okay, good idea. It got me to thinking.</p><p></p><p>I just took a FL die out of the drawer for 300 win mag and removed the expander spindle. It sized the neck to .329" with very little runout. My 300 win mag is a factory without a tight neck so I do not normally turn 300 win mag brass. So if this brass is unturned then after firing all the variance in neck thickness is transferred to the inside surface of the neck. </p><p></p><p>So with a .329" outside neck diameter the math would be .329"-.308"=.021"/2=.0105". If I wanted a .003" bullet grip I would turn then necks to .0105"+(.003"/2)=.012". </p><p></p><p>The problem seems to me that you want the neck variations on the outside of the neck for neck turning. A very tight mandrel could push the variations to the outside where the blade would cut them but it can be hard to insert those tight mandrels.</p><p></p><p>So how do you get the neck thickness variations to the outside for neck turning or do you use a reamer?</p></blockquote><p></p>
[QUOTE="woods, post: 248551, member: 6042"] Okay, good idea. It got me to thinking. I just took a FL die out of the drawer for 300 win mag and removed the expander spindle. It sized the neck to .329" with very little runout. My 300 win mag is a factory without a tight neck so I do not normally turn 300 win mag brass. So if this brass is unturned then after firing all the variance in neck thickness is transferred to the inside surface of the neck. So with a .329" outside neck diameter the math would be .329"-.308"=.021"/2=.0105". If I wanted a .003" bullet grip I would turn then necks to .0105"+(.003"/2)=.012". The problem seems to me that you want the neck variations on the outside of the neck for neck turning. A very tight mandrel could push the variations to the outside where the blade would cut them but it can be hard to insert those tight mandrels. So how do you get the neck thickness variations to the outside for neck turning or do you use a reamer? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Reducing runout suggestion
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