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Rifles, Reloading, Optics, Equipment
Reloading
Neck sizing with FL dies
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<blockquote data-quote="Bart B" data-source="post: 688470" data-attributes="member: 5302"><p>When folks back a bottleneck full length sizing die up a ways so it doesn't contact the shoulder, the shoulder typically gets moved forward a few thousandths. In the reloading industry, this is called partial neck sizing. It's usually enough to cause the bolt to bind when that case is chambered 'cause the case headspace is now a bit longer than chamber headspace. And that's a detriment to accuracy.</p><p></p><p>That aside, if one does get the best accuracy partial neck sizing bottleneck cases with a full length sizing die, it's my opinion that they might re-evaluate their traditional full length sizing processes where the fired case shoulder's set back a bit. They might also want to shoot a lot more shots per test group as most any case sizing and/or prep techinique will sometimes shoot a "wallet group" of 3 shots that its producer "knows" that's the best recipie to use for that bullet.</p></blockquote><p></p>
[QUOTE="Bart B, post: 688470, member: 5302"] When folks back a bottleneck full length sizing die up a ways so it doesn't contact the shoulder, the shoulder typically gets moved forward a few thousandths. In the reloading industry, this is called partial neck sizing. It's usually enough to cause the bolt to bind when that case is chambered 'cause the case headspace is now a bit longer than chamber headspace. And that's a detriment to accuracy. That aside, if one does get the best accuracy partial neck sizing bottleneck cases with a full length sizing die, it's my opinion that they might re-evaluate their traditional full length sizing processes where the fired case shoulder's set back a bit. They might also want to shoot a lot more shots per test group as most any case sizing and/or prep techinique will sometimes shoot a "wallet group" of 3 shots that its producer "knows" that's the best recipie to use for that bullet. [/QUOTE]
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Neck sizing with FL dies
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