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Rifles, Reloading, Optics, Equipment
Reloading
Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized
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<blockquote data-quote="Trickymissfit" data-source="post: 645520" data-attributes="member: 25383"><p>* what happens when you pull the trigger?</p><p> The primer goes off and starts the powder burn, and then causes a gas build up inside the case. Similar to a pneumatic gas cylinder. Everything expands in every directions till it meets enough resistence that it can't move anyfurther. Pressure then pushes the bullet thru the barrel. When the gas pressure reaches a certain point the brass case starts to expand, and then when the pressure is decreased to a certain point the case retracts back towards it orginal deminsion. That's called spring back, and they all do it.</p><p> </p><p>* Now we have twelve cases. Six are run thru Joe's space age full length die of somekind or another. Cases are sized back about .003" all the way around. But the other six cases are left untouched demensionally with the exception of shrinking the neck diameter. One set of cases has about .0045" of clearence in the chamber berses the case body. The other has about .002" clearence. The latter will have better alignment because of the amount the full length die resized the case. Yet neither one is perfect, but one of the is less than the other. Of course there's also the issue with the datum line in the shoulder verses the chamber giving a tighter lockup in the chamber (I'll let all of you cuss and discuss this)</p><p> </p><p>** BUT! What if you built a full length die that sized the case exactly .0015" all the way around with a bushing that sized the neck about 75% of the length? The bushing would float in a bore to find it's own center line with the case body (least resistence). I doubt there would be much difference at all. It's not the accuracey of the full length die but the amount it shrinks the case body.</p><p> </p><p>* benchrest chambers are rarely ever a standard chamber, so that also tells you some things. First in will usually be a very minimum if not undersized chamber (diameters). Secondly the necks are always a "tight neck" setup with about .0015" clearence, and this means a full length die ain't ever gonna work well unless it's made just for that chamber with a minimum resize. But could you do it with a custom built full length die is the question? Yes with the right die. Do you think that the Canadian guy that zapped a dude a half mile away used necked sized brass? About as good a chance as a cube of ice in Hades. His brass was full length sized at the factory before it was ever loaded.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 645520, member: 25383"] * what happens when you pull the trigger? The primer goes off and starts the powder burn, and then causes a gas build up inside the case. Similar to a pneumatic gas cylinder. Everything expands in every directions till it meets enough resistence that it can't move anyfurther. Pressure then pushes the bullet thru the barrel. When the gas pressure reaches a certain point the brass case starts to expand, and then when the pressure is decreased to a certain point the case retracts back towards it orginal deminsion. That's called spring back, and they all do it. * Now we have twelve cases. Six are run thru Joe's space age full length die of somekind or another. Cases are sized back about .003" all the way around. But the other six cases are left untouched demensionally with the exception of shrinking the neck diameter. One set of cases has about .0045" of clearence in the chamber berses the case body. The other has about .002" clearence. The latter will have better alignment because of the amount the full length die resized the case. Yet neither one is perfect, but one of the is less than the other. Of course there's also the issue with the datum line in the shoulder verses the chamber giving a tighter lockup in the chamber (I'll let all of you cuss and discuss this) ** BUT! What if you built a full length die that sized the case exactly .0015" all the way around with a bushing that sized the neck about 75% of the length? The bushing would float in a bore to find it's own center line with the case body (least resistence). I doubt there would be much difference at all. It's not the accuracey of the full length die but the amount it shrinks the case body. * benchrest chambers are rarely ever a standard chamber, so that also tells you some things. First in will usually be a very minimum if not undersized chamber (diameters). Secondly the necks are always a "tight neck" setup with about .0015" clearence, and this means a full length die ain't ever gonna work well unless it's made just for that chamber with a minimum resize. But could you do it with a custom built full length die is the question? Yes with the right die. Do you think that the Canadian guy that zapped a dude a half mile away used necked sized brass? About as good a chance as a cube of ice in Hades. His brass was full length sized at the factory before it was ever loaded. gary [/QUOTE]
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Chambered Round Alignment to Bore; Neck Sized vs Full Length Sized
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