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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Belted Cases Are A Pain
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<blockquote data-quote="Timber338" data-source="post: 970543" data-attributes="member: 33822"><p>I think there is a definite bonus to using the Redding Competition Shellholders over just adjusting the depth of the FL die. When you are only adjusting the depth of the die, the standard shellholder is not contacting the base of the die. With the variables present in the press resizing operation such as more/less case lube, more/less speed/force on the press handle, that air gap between the die and the shellholder is going to allow the entire system to flex more. Finite element modeling shows that this air gap can introduce quite a bit of variation in shoulder bump from case to case. When you use the Redding shellholders, the top of the shellholder always contacts the base of the die and you reduce the variation down to .002" for any case you resize. Which is also why the Redding Comp Shellholders are made in .002" increments. Using shims is basically doing the same thing, but in my opinion the shellholders are a much cleaner solution to the problem. ML McPherson wrote a great article on this I think called 'what happens to a case when it is resized'. I just did a quick google search but could not find it. Great read if you can find it.</p></blockquote><p></p>
[QUOTE="Timber338, post: 970543, member: 33822"] I think there is a definite bonus to using the Redding Competition Shellholders over just adjusting the depth of the FL die. When you are only adjusting the depth of the die, the standard shellholder is not contacting the base of the die. With the variables present in the press resizing operation such as more/less case lube, more/less speed/force on the press handle, that air gap between the die and the shellholder is going to allow the entire system to flex more. Finite element modeling shows that this air gap can introduce quite a bit of variation in shoulder bump from case to case. When you use the Redding shellholders, the top of the shellholder always contacts the base of the die and you reduce the variation down to .002" for any case you resize. Which is also why the Redding Comp Shellholders are made in .002" increments. Using shims is basically doing the same thing, but in my opinion the shellholders are a much cleaner solution to the problem. ML McPherson wrote a great article on this I think called 'what happens to a case when it is resized'. I just did a quick google search but could not find it. Great read if you can find it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Belted Cases Are A Pain
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