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Rifles, Reloading, Optics, Equipment
Reloading
Setting dies for a belted mag?
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<blockquote data-quote="boomtube" data-source="post: 469534" data-attributes="member: 9215"><p>As JE very correctly suggests, neither neck sizing nor full length sizing iof themselves offer any magic or certain results for either accuracy or case life. </p><p> </p><p>The effect on case life depends entirely on the specific diameter dimensions of the individual's chamber and size die chamber. If a the body of a FL die is largish and the chamber is smallish then FL sized cases won't be excessively worked and splits will be delayed. </p><p> </p><p>So far as the case's neck or type of die goes, if necks get worked more than the body, the necks will split sooner than the bodies. No great puzzle about that is there? And just how much it gets worked is, again, dependant on the actual diameters of the die and chamber necks. Conventional dies, any type, normally sizes necks down a lot more than would be best and then get expanded back up.</p><p> </p><p>On average, conventional neck sizers work the necks as much as conventional FL dies so there is no certainty that neck sizing will increase case life. Bushing neck dies, used correctly, can work necks less but we have to fiddle with finding the exact diameter bushing and that's a PITA as well as costly. I MUCH prefer using Lee's inexpensive Collet Neck Sizer, it obtains the best neck internal diameter without concern about how thick the necks are and it works the neck the absolute minimum to do it. The Lee neck die used with a body die is the best of all possible combonations, IMHO.</p><p> </p><p>Accuracy is often equal no matter the sizing method. The only way for anyone to KNOW which, if either, method works best in his rifle is to try both ways.</p><p> </p><p>I strongly suspect the record breaking 80 times fired case mentioned above was "FL sized" in a cusom made die, not a store bought one, and the chamber probably only had maybe a thou of clearance for the loaded cartridge. Neither of those conditions are normal so the results aren't normal and therefore it means nothing to us.</p></blockquote><p></p>
[QUOTE="boomtube, post: 469534, member: 9215"] As JE very correctly suggests, neither neck sizing nor full length sizing iof themselves offer any magic or certain results for either accuracy or case life. The effect on case life depends entirely on the specific diameter dimensions of the individual's chamber and size die chamber. If a the body of a FL die is largish and the chamber is smallish then FL sized cases won't be excessively worked and splits will be delayed. So far as the case's neck or type of die goes, if necks get worked more than the body, the necks will split sooner than the bodies. No great puzzle about that is there? And just how much it gets worked is, again, dependant on the actual diameters of the die and chamber necks. Conventional dies, any type, normally sizes necks down a lot more than would be best and then get expanded back up. On average, conventional neck sizers work the necks as much as conventional FL dies so there is no certainty that neck sizing will increase case life. Bushing neck dies, used correctly, can work necks less but we have to fiddle with finding the exact diameter bushing and that's a PITA as well as costly. I MUCH prefer using Lee's inexpensive Collet Neck Sizer, it obtains the best neck internal diameter without concern about how thick the necks are and it works the neck the absolute minimum to do it. The Lee neck die used with a body die is the best of all possible combonations, IMHO. Accuracy is often equal no matter the sizing method. The only way for anyone to KNOW which, if either, method works best in his rifle is to try both ways. I strongly suspect the record breaking 80 times fired case mentioned above was "FL sized" in a cusom made die, not a store bought one, and the chamber probably only had maybe a thou of clearance for the loaded cartridge. Neither of those conditions are normal so the results aren't normal and therefore it means nothing to us. [/QUOTE]
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Setting dies for a belted mag?
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