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Rifles, Reloading, Optics, Equipment
Reloading
Body sizing? A necessary step?
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<blockquote data-quote="Bart B" data-source="post: 519605" data-attributes="member: 5302"><p>The most accurate fired belted cases I know of are those full length resized setting the shoulder back a couple thousandths then body sized again with a second "body die" that sizes the fired case all the way to the shoulder getting rid of that "step" in front of the belt on fired cases. This body die is made by cuttiing off the bottom of a regular full length sizing die just above the belt relief and a little below the shoulder. It's set in the press such that the die barely touches the belt when the case is all the way up into the die.</p><p></p><p>What this method does is get rid of the ridge in front of the belt on fired cases that interferes with how the back end of the case fits the chamber. New cases also shoot just as accurate and that's because they don't have that step. A commercial version is available at <a href="http://www.larrywillis.com" target="_blank">Innovative Technologies - Reloading Equipment</a> and it works wonders.</p><p></p><p>I've fired 15-shot test groups at 1000 yards with both new cases and double sized fired ones. Both groups were about 6 inches. I doubt any benchrest rifle's shot that well with belted cases for 15 shots in a row. Sierra Bullets full length sizes their belted cases using Redding full bushing dies or standard full length dies for testing loads in rifles and rail guns for quality control. I doubt anyone shoots their bullets as accurate as they do. </p><p></p><p>When belted cases were favored for shoulder fired rifles in prone matches, new cases or fired ones double sized shot the best scores. New belted cases headspace on their belt and even if this leaves 5 or 6 thousandths clearance between case shoulder to the chamber shoulder when the round fires, it doesn't cause accuracy problems. The idea that belted cases have to headspace on their shoulder for best accuracy is a popular myth. Latest evidence of this is a year or so ago when new .300 Weatherby cases were used to set a benchrest record at 1000 yards.</p></blockquote><p></p>
[QUOTE="Bart B, post: 519605, member: 5302"] The most accurate fired belted cases I know of are those full length resized setting the shoulder back a couple thousandths then body sized again with a second "body die" that sizes the fired case all the way to the shoulder getting rid of that "step" in front of the belt on fired cases. This body die is made by cuttiing off the bottom of a regular full length sizing die just above the belt relief and a little below the shoulder. It's set in the press such that the die barely touches the belt when the case is all the way up into the die. What this method does is get rid of the ridge in front of the belt on fired cases that interferes with how the back end of the case fits the chamber. New cases also shoot just as accurate and that's because they don't have that step. A commercial version is available at [url=http://www.larrywillis.com]Innovative Technologies - Reloading Equipment[/url] and it works wonders. I've fired 15-shot test groups at 1000 yards with both new cases and double sized fired ones. Both groups were about 6 inches. I doubt any benchrest rifle's shot that well with belted cases for 15 shots in a row. Sierra Bullets full length sizes their belted cases using Redding full bushing dies or standard full length dies for testing loads in rifles and rail guns for quality control. I doubt anyone shoots their bullets as accurate as they do. When belted cases were favored for shoulder fired rifles in prone matches, new cases or fired ones double sized shot the best scores. New belted cases headspace on their belt and even if this leaves 5 or 6 thousandths clearance between case shoulder to the chamber shoulder when the round fires, it doesn't cause accuracy problems. The idea that belted cases have to headspace on their shoulder for best accuracy is a popular myth. Latest evidence of this is a year or so ago when new .300 Weatherby cases were used to set a benchrest record at 1000 yards. [/QUOTE]
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Body sizing? A necessary step?
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