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Rifles, Reloading, Optics, Equipment
Reloading
Expanding vs Turning Mandrels
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<blockquote data-quote="ntsqd" data-source="post: 2427574" data-attributes="member: 93138"><p>The more that you work the brass, the faster it will work harden. That's an unavoidable trait of the metal. Working it less means that you'll need to anneal less often.</p><p></p><p>What I've put together from reading this an other threads on the topic, see if I've distilled all of this correctly:</p><p>It is important to first figure out how much smaller the neck needs to be for any particular bullet. Maybe it is consistent across all of the bullets you choose to use in a particular case and rifle and maybe each has it's own ideal neck size. I don't know enough to know much about that.</p><p></p><p>Once you have the ideal neck size, then you can work out what the bushing size should be. The bushing needs to make the neck ID smaller than the expander so that the expander sets the final ID of the neck. How much smaller I've no idea, but I'll guess that less is more so long as it results in a consistent neck ID.</p><p></p><p>[ ] As an aside, I wonder if large over-bore cartridges with steep shoulder angles have a tendency to need annealing less often than those with shallower shoulder angles due to the heat of combustion partly annealing the neck on every firing?</p></blockquote><p></p>
[QUOTE="ntsqd, post: 2427574, member: 93138"] The more that you work the brass, the faster it will work harden. That's an unavoidable trait of the metal. Working it less means that you'll need to anneal less often. What I've put together from reading this an other threads on the topic, see if I've distilled all of this correctly: It is important to first figure out how much smaller the neck needs to be for any particular bullet. Maybe it is consistent across all of the bullets you choose to use in a particular case and rifle and maybe each has it's own ideal neck size. I don't know enough to know much about that. Once you have the ideal neck size, then you can work out what the bushing size should be. The bushing needs to make the neck ID smaller than the expander so that the expander sets the final ID of the neck. How much smaller I've no idea, but I'll guess that less is more so long as it results in a consistent neck ID. [ ] As an aside, I wonder if large over-bore cartridges with steep shoulder angles have a tendency to need annealing less often than those with shallower shoulder angles due to the heat of combustion partly annealing the neck on every firing? [/QUOTE]
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Expanding vs Turning Mandrels
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