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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning questions
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<blockquote data-quote="AZShooter" data-source="post: 1025397" data-attributes="member: 5219"><p>I found the same thing in several articles, don't turn go all the way to the shoulder, fireform, then turn up to new shoulder if necessary. </p><p></p><p>I turned the K and M turner into the shoulder when I made my 30BR/308. The 30 BR reamer was plunged deeper to headspace as a 308. I used Lapua brass and had to turn the necks down to .0105". The shoulder angle went from 20 degrees to 30 degrees. To date I have had no issues with the cases after 7 firings. The necks are thinner than what you will have but shoulder angle only increased by 10 degrees while yours will increase by 20 degrees. I would think you will have sufficient brass thickness in the necks to cut into shoulder (slightly) before fireforming. </p><p></p><p>I found this thread Dano says not to cut into the shoulder too far... </p><p></p><p>Dano1 one of our LRH posters says this:</p><p></p><p>"The key for turning it prior to fireforming it to not cut into the shoulder too far as to mess up your head spacing.... All Ackley improved design cases headspace off of this point while fireforming, so leaving enough is important as excessive headspacing will mess up the shoulder, cause casehead separations and other problems.....to find this point, turn the necks until the cutter slightly cuts into the shoulder, check the case in the the chamber and makesure it will still chamber with some slight resistance as it is crush fitting and headspacing. " </p><p></p><p> I then load and fireform and after resizing and cleaning, I check to see if I need to clean up the neck further, as the expander ball seems to push out any doughnut, this takes care of the problem for me."</p><p></p><p> link: <a href="http://www.longrangehunting.com/forums/f28/turn-necks-before-fire-forming-ackley-improved-74824/" target="_blank">http://www.longrangehunting.com/forums/f28/turn-necks-before-fire-forming-ackley-improved-74824/</a></p><p></p><p>I suppose if in doubt prep 20 cases and use them for a dozen firings to see if you have issues.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1025397, member: 5219"] I found the same thing in several articles, don't turn go all the way to the shoulder, fireform, then turn up to new shoulder if necessary. I turned the K and M turner into the shoulder when I made my 30BR/308. The 30 BR reamer was plunged deeper to headspace as a 308. I used Lapua brass and had to turn the necks down to .0105". The shoulder angle went from 20 degrees to 30 degrees. To date I have had no issues with the cases after 7 firings. The necks are thinner than what you will have but shoulder angle only increased by 10 degrees while yours will increase by 20 degrees. I would think you will have sufficient brass thickness in the necks to cut into shoulder (slightly) before fireforming. I found this thread Dano says not to cut into the shoulder too far... Dano1 one of our LRH posters says this: "The key for turning it prior to fireforming it to not cut into the shoulder too far as to mess up your head spacing.... All Ackley improved design cases headspace off of this point while fireforming, so leaving enough is important as excessive headspacing will mess up the shoulder, cause casehead separations and other problems.....to find this point, turn the necks until the cutter slightly cuts into the shoulder, check the case in the the chamber and makesure it will still chamber with some slight resistance as it is crush fitting and headspacing. " I then load and fireform and after resizing and cleaning, I check to see if I need to clean up the neck further, as the expander ball seems to push out any doughnut, this takes care of the problem for me." link: [url]http://www.longrangehunting.com/forums/f28/turn-necks-before-fire-forming-ackley-improved-74824/[/url] I suppose if in doubt prep 20 cases and use them for a dozen firings to see if you have issues. [/QUOTE]
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