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Rifles, Reloading, Optics, Equipment
Reloading
straightness
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<blockquote data-quote="Bart B" data-source="post: 369272" data-attributes="member: 5302"><p>While a Lee collet die may be the shortest path to straight case necks, it ain't what's used to make ammo that wins most of the high power rifle position and benchrest matches and set some records along the way.</p><p></p><p>The smallest many-shot groups I know of have all been shot with cases full length sized with their neck diameter 1 or 2 thousandths smaller than a loaded round's neck diameter. And they set the fired case shoulder back 2 thousandths. All rounds fired in standard SAAMI dimensioned chambers.</p><p></p><p>RCBS and Redding make dies like these. They use bushings (interchangeable between makes, too) sized in 1 thousandth increments for virtually all calibers. Sierra Bullets uses the Redding ones for cases they're made for to test their bullets for accuracy. Other cases get sized in standard Redding full length sizing dies. I doubt anybody shoots their bullets more accurate than they do. And Sierra's test barrels have standard SAAMI chambers.</p><p></p><p>Why do anything different? Probably 'cause one thinks another die or method works better. The benchresters are moving nowadays to full length bushing dies.</p></blockquote><p></p>
[QUOTE="Bart B, post: 369272, member: 5302"] While a Lee collet die may be the shortest path to straight case necks, it ain't what's used to make ammo that wins most of the high power rifle position and benchrest matches and set some records along the way. The smallest many-shot groups I know of have all been shot with cases full length sized with their neck diameter 1 or 2 thousandths smaller than a loaded round's neck diameter. And they set the fired case shoulder back 2 thousandths. All rounds fired in standard SAAMI dimensioned chambers. RCBS and Redding make dies like these. They use bushings (interchangeable between makes, too) sized in 1 thousandth increments for virtually all calibers. Sierra Bullets uses the Redding ones for cases they're made for to test their bullets for accuracy. Other cases get sized in standard Redding full length sizing dies. I doubt anybody shoots their bullets more accurate than they do. And Sierra's test barrels have standard SAAMI chambers. Why do anything different? Probably 'cause one thinks another die or method works better. The benchresters are moving nowadays to full length bushing dies. [/QUOTE]
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