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Rifles, Reloading, Optics, Equipment
Reloading
Do I need to neck turn?
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<blockquote data-quote="Bart B" data-source="post: 819493" data-attributes="member: 5302"><p>Many folks get 1/4 MOA accuracy at 100 yards, 1/3 at 300, 1/2 at 600 and 3/4 MOA at 1000 yards with unturned necks. As long as the neck wall thickness has less than a .001" spread, they're good to go.</p><p></p><p>Turning necks to a uniform thickness takes a 1/4 MOA (or better) at worst rifle and ammo to see the difference; plus someone who can consistantly shoot that stuff that well. Benchresters may well see a 1/16 to 1/8 MOA improvement shooting their super accurate rifles in free recoil. Folks shooting anything off their shoulder holding them with their hands as they rest atop something on a bench are hard pressed to see that much difference.</p><p></p><p>Neck walls can be 1/25th caliber (bore diameter) thick at a minimum. 30 caliber cases would then have a minimum neck wall thickness of .012". Some folks go thinner, but that may cause sizing problems with most dies unless you use one with bushings of the right size.</p><p></p><p>All in my opinion, naturally.</p><p></p><p>Fact: turning bottleneck case necks (on cases headspacing on their shoulder) to uniform diameters does not help center them in the chamber neck when they're fired. They float clear of the chamber neck wall by 1 up to a few thousandths. Those cases are centered in the chamber shoulder by their own shoulder. If the case neck's .001" off center on the case shoulder, it'll be off center in the chamber neck by the same amount.</p></blockquote><p></p>
[QUOTE="Bart B, post: 819493, member: 5302"] Many folks get 1/4 MOA accuracy at 100 yards, 1/3 at 300, 1/2 at 600 and 3/4 MOA at 1000 yards with unturned necks. As long as the neck wall thickness has less than a .001" spread, they're good to go. Turning necks to a uniform thickness takes a 1/4 MOA (or better) at worst rifle and ammo to see the difference; plus someone who can consistantly shoot that stuff that well. Benchresters may well see a 1/16 to 1/8 MOA improvement shooting their super accurate rifles in free recoil. Folks shooting anything off their shoulder holding them with their hands as they rest atop something on a bench are hard pressed to see that much difference. Neck walls can be 1/25th caliber (bore diameter) thick at a minimum. 30 caliber cases would then have a minimum neck wall thickness of .012". Some folks go thinner, but that may cause sizing problems with most dies unless you use one with bushings of the right size. All in my opinion, naturally. Fact: turning bottleneck case necks (on cases headspacing on their shoulder) to uniform diameters does not help center them in the chamber neck when they're fired. They float clear of the chamber neck wall by 1 up to a few thousandths. Those cases are centered in the chamber shoulder by their own shoulder. If the case neck's .001" off center on the case shoulder, it'll be off center in the chamber neck by the same amount. [/QUOTE]
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Reloading
Do I need to neck turn?
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