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Rifles, Reloading, Optics, Equipment
Reloading
SIMPLE question on neck tension
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<blockquote data-quote="AZShooter" data-source="post: 1842498" data-attributes="member: 5219"><p>Everything you mentioned except the actual diameters were correct. Shouldn't a 30 cal bullet be .308"? So neck would be .001" less. Could also be called a press fit or force fit. .</p><p></p><p>Most RCBS FL dies I have used will produce a .003" difference between brass neck ID and bullet diameter. That is a good starting point for a hunting rifle. I would say that much more than that could cause enough pressure to induce runout with "bent" necks.</p><p></p><p>It is possible to go the other way with less than a .001" press fit with a single shot bench rifle called soft seating. The bullet is seated long and the bolt will push cartridge into chamber with enough force to push bullet into case so ogive of bullet is contacting the lands with same engagement for each round. Only issue with this minimal neck tension is if for some reason the shooter decides to remove cartridge without firing as it most likely will leave bullet in the barrel.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1842498, member: 5219"] Everything you mentioned except the actual diameters were correct. Shouldn't a 30 cal bullet be .308"? So neck would be .001" less. Could also be called a press fit or force fit. . Most RCBS FL dies I have used will produce a .003" difference between brass neck ID and bullet diameter. That is a good starting point for a hunting rifle. I would say that much more than that could cause enough pressure to induce runout with "bent" necks. It is possible to go the other way with less than a .001" press fit with a single shot bench rifle called soft seating. The bullet is seated long and the bolt will push cartridge into chamber with enough force to push bullet into case so ogive of bullet is contacting the lands with same engagement for each round. Only issue with this minimal neck tension is if for some reason the shooter decides to remove cartridge without firing as it most likely will leave bullet in the barrel. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
SIMPLE question on neck tension
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