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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Tight neck chamber
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<blockquote data-quote="Mikecr" data-source="post: 1095259" data-attributes="member: 1521"><p>Personally, I consider anything >2thou over loaded OD as sloppy/factory.</p><p>With 2thou clearance the neck will expand ~2thou and spring back ~1thou to pull from the chamber ~1thou over loaded OD. With a proper bushing of 2thou under loaded OD we squeeze down 3thou and spring back to 1thou under cal. You can & should go another 1/2thou squeeze and follow with neck mandrel expansion.There is absolutely no problem in this plan, and the necks would only need process annealing about every ~30 reload cycles. This can be extended way further with tighter clearances, so there is tension consistency here that most reloaders cannot achieve otherwise(without very very good annealing).</p><p>Truly, necks with ANY clearance, will free release bullets with no affect to pressure. That is, you could have 0.000000001" of clearance, and while a cartridge that is not so straight will be in chambered tension, the neck will still expand to release the bullet.</p><p></p><p>I consider required neck turning to provide <2thou clearance as 'tight'.</p><p>Anything <1thou clearance is 'fitted'.</p><p>I run a tight chamber with which I've fitted necks(<1thou). My load produces ~8fps ES as measured with 20' screen spacing on an Oehler. Pretty good from IMR4350 near SAAMI max(not over).</p><p>I don't size these necks at all, will never need to, and with this the neck tension will never change.</p><p></p><p>Certainly I know this isn't for everyone. But I also see calls for excess in clearances, including body, necks, and trim length, as more of paranoia and misunderstandings -than actual understanding.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1095259, member: 1521"] Personally, I consider anything >2thou over loaded OD as sloppy/factory. With 2thou clearance the neck will expand ~2thou and spring back ~1thou to pull from the chamber ~1thou over loaded OD. With a proper bushing of 2thou under loaded OD we squeeze down 3thou and spring back to 1thou under cal. You can & should go another 1/2thou squeeze and follow with neck mandrel expansion.There is absolutely no problem in this plan, and the necks would only need process annealing about every ~30 reload cycles. This can be extended way further with tighter clearances, so there is tension consistency here that most reloaders cannot achieve otherwise(without very very good annealing). Truly, necks with ANY clearance, will free release bullets with no affect to pressure. That is, you could have 0.000000001" of clearance, and while a cartridge that is not so straight will be in chambered tension, the neck will still expand to release the bullet. I consider required neck turning to provide <2thou clearance as 'tight'. Anything <1thou clearance is 'fitted'. I run a tight chamber with which I've fitted necks(<1thou). My load produces ~8fps ES as measured with 20' screen spacing on an Oehler. Pretty good from IMR4350 near SAAMI max(not over). I don't size these necks at all, will never need to, and with this the neck tension will never change. Certainly I know this isn't for everyone. But I also see calls for excess in clearances, including body, necks, and trim length, as more of paranoia and misunderstandings -than actual understanding. [/QUOTE]
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Tight neck chamber
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