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Rifles, Reloading, Optics, Equipment
Reloading
Run-out help needed
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<blockquote data-quote="Bart B" data-source="post: 740316" data-attributes="member: 5302"><p>The Lee collet neck sizing die, like all other neck only sizing dies that don't hold the case shoulder and front part of the case body well aligned with the case neck, don't do as good of a job of keeping the case neck well centered on the case shoulder. Which is why this die is not popular (and rarely, if ever, used by folks shooting the best scores and smallest groups in competition. If one' not able to measure the runtout of the case neck relative to the shoulder on a sized case, they'll typically not be able to see this issue. Case necks need to be well centered on all bottleneck cases that headspace on their shoulders. It's the case shoulder that centers the front of the case and therefore the neck and the bullet it holds in the chamber when the round fires; if the case neck ain't centered on the shoulder, there's no way it'll be centered in the chamber neck.</p><p></p><p>Virtuall all the benchresters gave up on neck only sizing years ago and have switched over to the full length sizing dies with bushings of the correct diameter for their case necks. Such dies keep the case neck well centered on the case shoulder but size the case body and neck down very little and set the fired case sholder back a thousandth or so. Sierra Bullets was probably the first place where enough proper tests were made with various sizing dies and techniques back in the 1950's. They've been using full length sizing dies ever since; nothing else sized cases good enough dimension wise to shoot their bullets into the smallest test groups. Nowadays, they use Redding full length bushing dies or standard full length sizing dies on their fired cases to resize them. Those dies work the same way and use the same bushings as the ones made by RCBS.</p><p></p><p>So, Mike027, if you've read this, you have read something about collet neck sizing dies that's not positive. And I think ajhardle's comment on your sized case necks being too small is a good think to consider. There's probably enough force on the case neck from the bullet needing so much force to seat it that the case neck's pressing down hard enough on the case shoulder to bend it. This can be seen if you can measure neck runout on a sized case. But you'll have to have the front rest on the case at mid point on the shoulder, not on the bullet, case body or case neck to see it.</p><p></p><p>All the above aside, if one does not use a good quality full length sizing die and/or set it up and use it correctly, they may well get better results by some neck only sizing method.</p></blockquote><p></p>
[QUOTE="Bart B, post: 740316, member: 5302"] The Lee collet neck sizing die, like all other neck only sizing dies that don't hold the case shoulder and front part of the case body well aligned with the case neck, don't do as good of a job of keeping the case neck well centered on the case shoulder. Which is why this die is not popular (and rarely, if ever, used by folks shooting the best scores and smallest groups in competition. If one' not able to measure the runtout of the case neck relative to the shoulder on a sized case, they'll typically not be able to see this issue. Case necks need to be well centered on all bottleneck cases that headspace on their shoulders. It's the case shoulder that centers the front of the case and therefore the neck and the bullet it holds in the chamber when the round fires; if the case neck ain't centered on the shoulder, there's no way it'll be centered in the chamber neck. Virtuall all the benchresters gave up on neck only sizing years ago and have switched over to the full length sizing dies with bushings of the correct diameter for their case necks. Such dies keep the case neck well centered on the case shoulder but size the case body and neck down very little and set the fired case sholder back a thousandth or so. Sierra Bullets was probably the first place where enough proper tests were made with various sizing dies and techniques back in the 1950's. They've been using full length sizing dies ever since; nothing else sized cases good enough dimension wise to shoot their bullets into the smallest test groups. Nowadays, they use Redding full length bushing dies or standard full length sizing dies on their fired cases to resize them. Those dies work the same way and use the same bushings as the ones made by RCBS. So, Mike027, if you've read this, you have read something about collet neck sizing dies that's not positive. And I think ajhardle's comment on your sized case necks being too small is a good think to consider. There's probably enough force on the case neck from the bullet needing so much force to seat it that the case neck's pressing down hard enough on the case shoulder to bend it. This can be seen if you can measure neck runout on a sized case. But you'll have to have the front rest on the case at mid point on the shoulder, not on the bullet, case body or case neck to see it. All the above aside, if one does not use a good quality full length sizing die and/or set it up and use it correctly, they may well get better results by some neck only sizing method. [/QUOTE]
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