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Rifles, Reloading, Optics, Equipment
Reloading
Neck diameter clearance on tight neck chamber
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<blockquote data-quote="J E Custom" data-source="post: 1837275" data-attributes="member: 2736"><p>You need .003 to .004 thousandths for expansion to release the bullet correctly. </p><p></p><p>Check the neck diameter of a fired case in that chamber and then add the bullet diameter + the wall thickness of each side and you should have .003 to .004 difference. If there is less than .003 difference you will need to turn the necks more.</p><p></p><p>Once you have the chamber dimension, and the loaded dimension then reduce the neck by .0015 or .002 smaller than the total dimension of the bullet and the wall thickness x 2 for the bullet grip Example; ( .308 +.014 + .014 = .336 - .002 = .334) .334 should be the bushing size as long as the brass is annealed and does not have much spring back. You might have to go with a .333 bushing</p><p>to account for Spring back.</p><p></p><p>I Recommend removing the expander ball when using bushing dies to get the right sizing of the neck.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1837275, member: 2736"] You need .003 to .004 thousandths for expansion to release the bullet correctly. Check the neck diameter of a fired case in that chamber and then add the bullet diameter + the wall thickness of each side and you should have .003 to .004 difference. If there is less than .003 difference you will need to turn the necks more. Once you have the chamber dimension, and the loaded dimension then reduce the neck by .0015 or .002 smaller than the total dimension of the bullet and the wall thickness x 2 for the bullet grip Example; ( .308 +.014 + .014 = .336 - .002 = .334) .334 should be the bushing size as long as the brass is annealed and does not have much spring back. You might have to go with a .333 bushing to account for Spring back. I Recommend removing the expander ball when using bushing dies to get the right sizing of the neck. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck diameter clearance on tight neck chamber
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