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Rifles, Reloading, Optics, Equipment
Reloading
K and m neck turning tool
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<blockquote data-quote="Canadian Bushman" data-source="post: 1026169" data-attributes="member: 41122"><p>I disagree. </p><p>The k&m shell holder is a rigid mount that runs very crooked. No amount of free movement will allow you to apply force in a manner which is true to the longitudinal axis of the case. Over time your muscles fatigue and what you think is compensating for bad alignment begins exaggerating it. The solution is to mount the case in a manner that allows it to run more concentrically with the longitudinal axis. Which is how the sinclair tool, rcbs tool, and the collet of my mill all do. 90 percent of the time the body of a case will be more parallel to the walls of the neck than the head will be perpendicular to it. The body also offers much more surface area for holding power than the area of the head. </p><p></p><p>In my mill, chucking on the od of the body, my cases usually run within .001-.005 and are aligned over the centerline of the axis of the mandrel within .001. Since it is rigid it never moves each one of my cases will be held the same. It is also a controlled rpm so the cutter is being introduced to the brass at the same speed everytime. I highly doubt anyone can reproduce more consistent results by hand. </p><p></p><p>Last batch i neck turned the entire lot of 300 measured within .0005" variation of thickness and many were within .0001-.0002". After initial fire forming this brass also produces very good run out and extremely consitent neck tension. I have no doubts in my methods.</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 1026169, member: 41122"] I disagree. The k&m shell holder is a rigid mount that runs very crooked. No amount of free movement will allow you to apply force in a manner which is true to the longitudinal axis of the case. Over time your muscles fatigue and what you think is compensating for bad alignment begins exaggerating it. The solution is to mount the case in a manner that allows it to run more concentrically with the longitudinal axis. Which is how the sinclair tool, rcbs tool, and the collet of my mill all do. 90 percent of the time the body of a case will be more parallel to the walls of the neck than the head will be perpendicular to it. The body also offers much more surface area for holding power than the area of the head. In my mill, chucking on the od of the body, my cases usually run within .001-.005 and are aligned over the centerline of the axis of the mandrel within .001. Since it is rigid it never moves each one of my cases will be held the same. It is also a controlled rpm so the cutter is being introduced to the brass at the same speed everytime. I highly doubt anyone can reproduce more consistent results by hand. Last batch i neck turned the entire lot of 300 measured within .0005" variation of thickness and many were within .0001-.0002". After initial fire forming this brass also produces very good run out and extremely consitent neck tension. I have no doubts in my methods. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
K and m neck turning tool
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