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Rifles, Reloading, Optics, Equipment
Reloading
Presses and runout
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<blockquote data-quote="J E Custom" data-source="post: 1569282" data-attributes="member: 2736"><p>The idea of a floating die and shell holder is not new. Many years ago Bonanza made one and now forester has bought them out.</p><p></p><p>The concept is to allow the die to center over the case to allow the case to be sized without any misalignment that could cause concentricity issues. All presses are machined to a tolerance and a slight misalignment is/may be present. The press is strong enough to alter the case if alignment is not perfect, so the concept of a floating die and shell holder "Should" solve this. (At least in theory).</p><p></p><p>I have done some extensive testing as to how much concentricity is necessary for best accuracy and my findings were fairly consistent and linear. I used one of my most accurate rifles for the test and the results were predictable.</p><p></p><p>.000 run out produced 3 different groups of .054, .053 and .057 (3 shots @ 100 yards.</p><p></p><p>.001 run out cartridges produced 3 groups ranging from .069 to.076.</p><p></p><p>Cartridges with .002 run out produced 3 groups ranging from .091 to .123. </p><p>The first group I shot with .003 run out jumped to over .200 so the test was discontinued. </p><p></p><p>In an attempt to save the loads with over .003 run out I tried to straighten the loads and found that even the ones that i was able to get below .001 did not shoot as well as the ones loaded to .002.</p><p></p><p>It did help, and straightening these rounds could save them for hunting at closer distances, but for pure accuracy they must be loaded straight to perform their best.</p><p></p><p>Accuracy is relative to the shooters needs and these differences may not be important to some. but it shows me that concentric ammo does make a difference.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1569282, member: 2736"] The idea of a floating die and shell holder is not new. Many years ago Bonanza made one and now forester has bought them out. The concept is to allow the die to center over the case to allow the case to be sized without any misalignment that could cause concentricity issues. All presses are machined to a tolerance and a slight misalignment is/may be present. The press is strong enough to alter the case if alignment is not perfect, so the concept of a floating die and shell holder "Should" solve this. (At least in theory). I have done some extensive testing as to how much concentricity is necessary for best accuracy and my findings were fairly consistent and linear. I used one of my most accurate rifles for the test and the results were predictable. .000 run out produced 3 different groups of .054, .053 and .057 (3 shots @ 100 yards. .001 run out cartridges produced 3 groups ranging from .069 to.076. Cartridges with .002 run out produced 3 groups ranging from .091 to .123. The first group I shot with .003 run out jumped to over .200 so the test was discontinued. In an attempt to save the loads with over .003 run out I tried to straighten the loads and found that even the ones that i was able to get below .001 did not shoot as well as the ones loaded to .002. It did help, and straightening these rounds could save them for hunting at closer distances, but for pure accuracy they must be loaded straight to perform their best. Accuracy is relative to the shooters needs and these differences may not be important to some. but it shows me that concentric ammo does make a difference. J E CUSTOM [/QUOTE]
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Presses and runout
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