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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair Expander Mandrel Die Test
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<blockquote data-quote="BrentM" data-source="post: 1826781" data-attributes="member: 61747"><p>There are a lot of ways to get the same result so not everything is set in stone. Those of us who us mandrels do it for the combination of inside neck expansion vs outside neck restriction, run out, and neck tension consistency. For example I like to turn all my necks down just enough to get rid of the neck thickness consistency issues but with this method I have good enough results to not have to turn necks. I full size using a bushing fl sizing die and decapper with no expander ball. I then mandrel expand the neck. So it takes 2 runs through a die to complete the sizing process. On neck turned brass the run out is less than non but not a lot. However, during seating with a competition floating head seater I still seat 1/3, rotate the case, seat 2/3, rotate and finish the seating. It's just a habit now. In doing direct comparisons of rotating vs not rotating, I have seen .003 difference. Rotating I expect .001 or less run out. With out rotating I expect .002-.005 and hope for the lesser. It is not enough to probably worry about. What I do see is lower es/sd with the mandrel vs bushing only as a whole. It seems getting under 10 sd is that hard with consistent process controlling neck tension.</p></blockquote><p></p>
[QUOTE="BrentM, post: 1826781, member: 61747"] There are a lot of ways to get the same result so not everything is set in stone. Those of us who us mandrels do it for the combination of inside neck expansion vs outside neck restriction, run out, and neck tension consistency. For example I like to turn all my necks down just enough to get rid of the neck thickness consistency issues but with this method I have good enough results to not have to turn necks. I full size using a bushing fl sizing die and decapper with no expander ball. I then mandrel expand the neck. So it takes 2 runs through a die to complete the sizing process. On neck turned brass the run out is less than non but not a lot. However, during seating with a competition floating head seater I still seat 1/3, rotate the case, seat 2/3, rotate and finish the seating. It's just a habit now. In doing direct comparisons of rotating vs not rotating, I have seen .003 difference. Rotating I expect .001 or less run out. With out rotating I expect .002-.005 and hope for the lesser. It is not enough to probably worry about. What I do see is lower es/sd with the mandrel vs bushing only as a whole. It seems getting under 10 sd is that hard with consistent process controlling neck tension. [/QUOTE]
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Sinclair Expander Mandrel Die Test
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