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Rifles, Reloading, Optics, Equipment
Reloading
RCBS Die Adjustment
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<blockquote data-quote="Bart B" data-source="post: 565725" data-attributes="member: 5302"><p>A well known problem with using full length sizing dies to size only part of a bottleneck case's neck is at issue here. Such techniques usually end up pushing the fired case shoulder forward a bit. If there's any binding when closing the bolt on a case partially sized in a full length die, that will surely cause the bolt head to seat in a different place for each shot. And that's a sure cause of poor accuracy. Sierra Bullets tried this partial sizing method back in the early 1950's for their bottleneck cases used to test bullet for accuracy. Didn't work very well. They got best accuracy then and still do today with proper full length sized bottleneck cases. Don't believe me? Ask them via their web site.</p><p></p><p>What's important is that the fired case shoulder has to be set back a couple thousandths. This lets the bolt close home on a chambered case exactly the same way for each shot. The most accurate rifles tested at ranges further than 200 yards I know of have all done as well as they do with such fired case sizing. But you'll need a case gage to measure how much the shoulder gets set back.</p></blockquote><p></p>
[QUOTE="Bart B, post: 565725, member: 5302"] A well known problem with using full length sizing dies to size only part of a bottleneck case's neck is at issue here. Such techniques usually end up pushing the fired case shoulder forward a bit. If there's any binding when closing the bolt on a case partially sized in a full length die, that will surely cause the bolt head to seat in a different place for each shot. And that's a sure cause of poor accuracy. Sierra Bullets tried this partial sizing method back in the early 1950's for their bottleneck cases used to test bullet for accuracy. Didn't work very well. They got best accuracy then and still do today with proper full length sized bottleneck cases. Don't believe me? Ask them via their web site. What's important is that the fired case shoulder has to be set back a couple thousandths. This lets the bolt close home on a chambered case exactly the same way for each shot. The most accurate rifles tested at ranges further than 200 yards I know of have all done as well as they do with such fired case sizing. But you'll need a case gage to measure how much the shoulder gets set back. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
RCBS Die Adjustment
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