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Rifles, Reloading, Optics, Equipment
Reloading
Expander ball fact or fiction
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<blockquote data-quote="bigedp51" data-source="post: 1211266" data-attributes="member: 28965"><p>Boozer</p><p></p><p>The Forster expander does not float on the spindle assembly, the spindle shaft floats and self centers with the case neck centered in the neck of the die. </p><p></p><p>And you can't make a silk purse out of a sows ear and neck turning will not center the bullet in the case if it does not have uniform case wall thickness.</p><p></p><p><img src="http://i122.photobucket.com/albums/o254/bigedp51/neckcenter_zps94286f86.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>A full length resized case is supported by the bolt face in the rear and by the bullet in the chambers throat. The body and neck of the full length resized case does not touch the chamber walls. And only the shoulder of the case is touching the chambers shoulder being pushed forward by the ejector.</p><p></p><p>Bottom line, neck turing does not center the bullet in the throat and only effects bullet grip uniformity. </p><p></p><p>Too much of what benchrest shooters do with their custom rifles with tight neck chamber filters down to us and is not needed.</p><p></p><p>If you reduce the neck diameter .005 or more with bushing dies you will induce neck runout. If you do not neck turn you still need to use the expander with a bushing die.</p><p></p><p>The greatest stress on your case neck is expanding to the neck diameter of your chamber when fired. And resizing the case neck is a minor part of the stress put on the case neck.</p><p></p><p>Your factory rifles have SAAMI chambers and your factory dies are made to SAAMI dimensions. So lube the inside of your case necks and forget all the hype about expanders being the worst thing in the world for your brass. And again Whidden custom dies tells you they get the least amount of neck runout with a standard non-bushing full length die using a expander.</p><p></p><p>If you want more uniformity with your brass then buy Lapua.</p><p></p><p>In the photos below is a average Remington .223 case with .004 neck thickness variation and some of the cases had .008 neck thickness variation.</p><p></p><p> <img src="http://i122.photobucket.com/albums/o254/bigedp51/IMG_2136_zps079ece9b.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i122.photobucket.com/albums/o254/bigedp51/IMG_2137_zps66bcfc13.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The military considers match grade ammunition to be .003 or less runout. And Forster dies will produce the least amount of neck runout of any die.</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1211266, member: 28965"] Boozer The Forster expander does not float on the spindle assembly, the spindle shaft floats and self centers with the case neck centered in the neck of the die. And you can't make a silk purse out of a sows ear and neck turning will not center the bullet in the case if it does not have uniform case wall thickness. [IMG]http://i122.photobucket.com/albums/o254/bigedp51/neckcenter_zps94286f86.jpg[/IMG] A full length resized case is supported by the bolt face in the rear and by the bullet in the chambers throat. The body and neck of the full length resized case does not touch the chamber walls. And only the shoulder of the case is touching the chambers shoulder being pushed forward by the ejector. Bottom line, neck turing does not center the bullet in the throat and only effects bullet grip uniformity. Too much of what benchrest shooters do with their custom rifles with tight neck chamber filters down to us and is not needed. If you reduce the neck diameter .005 or more with bushing dies you will induce neck runout. If you do not neck turn you still need to use the expander with a bushing die. The greatest stress on your case neck is expanding to the neck diameter of your chamber when fired. And resizing the case neck is a minor part of the stress put on the case neck. Your factory rifles have SAAMI chambers and your factory dies are made to SAAMI dimensions. So lube the inside of your case necks and forget all the hype about expanders being the worst thing in the world for your brass. And again Whidden custom dies tells you they get the least amount of neck runout with a standard non-bushing full length die using a expander. If you want more uniformity with your brass then buy Lapua. In the photos below is a average Remington .223 case with .004 neck thickness variation and some of the cases had .008 neck thickness variation. [IMG]http://i122.photobucket.com/albums/o254/bigedp51/IMG_2136_zps079ece9b.jpg[/IMG] [IMG]http://i122.photobucket.com/albums/o254/bigedp51/IMG_2137_zps66bcfc13.jpg[/IMG] The military considers match grade ammunition to be .003 or less runout. And Forster dies will produce the least amount of neck runout of any die. [/QUOTE]
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