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Rifles, Reloading, Optics, Equipment
Reloading
Determining neck bushing size for die
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<blockquote data-quote="Mikecr" data-source="post: 1106986" data-attributes="member: 1521"><p>[CYBER SLAP] Look at the mess you're getting yourself into!</p><p></p><p>Your chamber neck is .322</p><p>Your neck brass is .145 thick, X2 is .029, over .284 bullets = .313</p><p>.322-.313 = .009 clearance already(excessive)</p><p>Don't ream or turn further.</p><p></p><p>Not sure why you're not using 7WSM brass.</p><p>Sizing down 300 to 7mm will thicken necks but you will still have plenty of clearance.</p><p></p><p>You intend to seat bullet bearing through neck-shoulder junction? </p><p>That's more bad planning..[CYBER SLAP]</p><p>But you can do this by partial neck sizing with bushings followed by expanding donut area outward, every time, away from seated bearing. You should have all the clearance in the world to provide for this. I recommend Sinclair's expander die setup.</p><p></p><p>That's it; </p><p>Partial bushing neck sizing including normal expansion.</p><p>With huge clearance, plan to anneal every time, or the necks won't survive long, much less give you consistent tension.</p><p>For your case I would start with a .311 bushing for unturned/unreamed necks followed by expansion.</p><p>Again with huge clearance, bushings over size at >5thou change, so .311 is only a beginning guess.</p><p>Down load first fire forming shots (to near min load). Develop with formed brass.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1106986, member: 1521"] [CYBER SLAP] Look at the mess you're getting yourself into! Your chamber neck is .322 Your neck brass is .145 thick, X2 is .029, over .284 bullets = .313 .322-.313 = .009 clearance already(excessive) Don't ream or turn further. Not sure why you're not using 7WSM brass. Sizing down 300 to 7mm will thicken necks but you will still have plenty of clearance. You intend to seat bullet bearing through neck-shoulder junction? That's more bad planning..[CYBER SLAP] But you can do this by partial neck sizing with bushings followed by expanding donut area outward, every time, away from seated bearing. You should have all the clearance in the world to provide for this. I recommend Sinclair's expander die setup. That's it; Partial bushing neck sizing including normal expansion. With huge clearance, plan to anneal every time, or the necks won't survive long, much less give you consistent tension. For your case I would start with a .311 bushing for unturned/unreamed necks followed by expansion. Again with huge clearance, bushings over size at >5thou change, so .311 is only a beginning guess. Down load first fire forming shots (to near min load). Develop with formed brass. [/QUOTE]
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Determining neck bushing size for die
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