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264 win mag
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<blockquote data-quote="Bart B" data-source="post: 341587" data-attributes="member: 5302"><p>Yobuck, outside turning down of case necks might help a tiny bit, but I don't think the neck wall thickness should be less than 12/1000ths inch. That's 'cause standard chamber necks' diameters would allow too much expansion of the neck when the round's fired. More brass expansion from firing and contraction from sizing work-hardens the brass making it too brittle. And split necks are gonna happen soon.</p><p></p><p>Best thing I've ever done with full length sizing dies with standard necks and using an expander ball to get sized case necks reasonably straight was as follows. After depriming fired cases, I'd run their mouths over a good, stiff bore brush spinning in a drill press. I often used .270 bronze bore brushes to clean my .264 Win. Mag. case mouths; barrels, too for that matter. Two passes of the mouth over that brush removes virtually of the powder residue and makes the brass inside the neck smoother.</p><p></p><p>After those cases have now been tumbled or vibrated clean, their mouths are much cleaner and smoother. That means the expander ball won't have cruddy, rough powder fouling to resist its passage up through the sized down case mouth when the ram lowers. Necks so cleaned tend to be straighter than uncleaned case mouths coming out of the die. It helps if the expander ball is very smooth; polishing down a .270 expander ball down to the diameter of your .264 ball will help, too.</p></blockquote><p></p>
[QUOTE="Bart B, post: 341587, member: 5302"] Yobuck, outside turning down of case necks might help a tiny bit, but I don't think the neck wall thickness should be less than 12/1000ths inch. That's 'cause standard chamber necks' diameters would allow too much expansion of the neck when the round's fired. More brass expansion from firing and contraction from sizing work-hardens the brass making it too brittle. And split necks are gonna happen soon. Best thing I've ever done with full length sizing dies with standard necks and using an expander ball to get sized case necks reasonably straight was as follows. After depriming fired cases, I'd run their mouths over a good, stiff bore brush spinning in a drill press. I often used .270 bronze bore brushes to clean my .264 Win. Mag. case mouths; barrels, too for that matter. Two passes of the mouth over that brush removes virtually of the powder residue and makes the brass inside the neck smoother. After those cases have now been tumbled or vibrated clean, their mouths are much cleaner and smoother. That means the expander ball won't have cruddy, rough powder fouling to resist its passage up through the sized down case mouth when the ram lowers. Necks so cleaned tend to be straighter than uncleaned case mouths coming out of the die. It helps if the expander ball is very smooth; polishing down a .270 expander ball down to the diameter of your .264 ball will help, too. [/QUOTE]
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