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Rifles, Reloading, Optics, Equipment
Reloading
To inside ream or neck turn
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<blockquote data-quote="J E Custom" data-source="post: 1612693" data-attributes="member: 2736"><p>Over the years, I have tried about everything known to man and found reaming the necks not to be satisfactory and inconsistent. When I reamed, the neck wall was not the same thickness because the reamer found it's own center. I set up in a lathe and it still happened although</p><p>not very much. The best way I found was to use a sizing mandrel to size the neck to perfectly fit the turning mandrel. With the neck wall thickness exactly the same the chamber will do the rest if it is concentric. I have had several other neck turners that just used caliber specific mandrels and they never realy fit that good, and I ended up making a mandrel almost every time I turned necks to get a good fit.</p><p></p><p>Once I went to the sizing type (I use the Sinclair with the sizer and turning mandrel) There were no more issues. As said before, I prefer turning the necks before they are fired so the first firing trues the neck concentricity, Most brass will have some run out before it is fired. by truing the neck wall thickness first the chamber will do the rest. Since going this route, I can find no run out in the fired brass</p><p>inside or out. another advantage of turning before firing is that when the neck expands to fit the chamber there is no wall thickness difference to move the neck bore off center. (If the neck wall is .001 thousandths different on one side, the bore will move .001 thousandths to the other side , moving the bore center off by .001 to the barrel center.</p><p></p><p>Turning necks correctly is very necessary in my opinion if turning doesn't produce concentric cases, then all it does is thin the necks.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1612693, member: 2736"] Over the years, I have tried about everything known to man and found reaming the necks not to be satisfactory and inconsistent. When I reamed, the neck wall was not the same thickness because the reamer found it's own center. I set up in a lathe and it still happened although not very much. The best way I found was to use a sizing mandrel to size the neck to perfectly fit the turning mandrel. With the neck wall thickness exactly the same the chamber will do the rest if it is concentric. I have had several other neck turners that just used caliber specific mandrels and they never realy fit that good, and I ended up making a mandrel almost every time I turned necks to get a good fit. Once I went to the sizing type (I use the Sinclair with the sizer and turning mandrel) There were no more issues. As said before, I prefer turning the necks before they are fired so the first firing trues the neck concentricity, Most brass will have some run out before it is fired. by truing the neck wall thickness first the chamber will do the rest. Since going this route, I can find no run out in the fired brass inside or out. another advantage of turning before firing is that when the neck expands to fit the chamber there is no wall thickness difference to move the neck bore off center. (If the neck wall is .001 thousandths different on one side, the bore will move .001 thousandths to the other side , moving the bore center off by .001 to the barrel center. Turning necks correctly is very necessary in my opinion if turning doesn't produce concentric cases, then all it does is thin the necks. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
To inside ream or neck turn
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