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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning
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<blockquote data-quote="Hugnot" data-source="post: 2810028" data-attributes="member: 115658"><p>Turn necks & stop using an expander button in your F/L die, Amount of neck turning depends on chamber. Neck turning amount is ideal when nice slip fit is obtained with bullet & fired brass. uniform neck tension, reduce cold working & extend brass life. Chamber dimensions are set by SAAMI specs.</p><p></p><p>My 6.5 rounds after firing measure .297 (brass spring back) and upon bullet seating measure .290, (.003-.004 radius reduction). Neck wall thickness = .290 - .264 = .026 / 2 = .013, that neck wall thickness provides a nice slip fit, minimum work hardening, adequate neck tension & cleanup for minimal run out. Brass neck wall thickness may vary .001 or more but turning make neck walls uniform,</p><p></p><p>Periodic annealing helps to reduce brass spring back.</p><p></p><p>Ball micrometers are needed for measuring neck wall thicknesses, but ordinary calipers can suffice to determine diameters that provide nice slip fits of bullets into fired cases. </p><p></p><p>The next problem is setting up the neck turning devices for accurate repetitive neck turning among different cartridges, bullet diameters & chambers - next to impossible or real difficult. I need to get better stuff or by separate neck turners for each chamber.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2810028, member: 115658"] Turn necks & stop using an expander button in your F/L die, Amount of neck turning depends on chamber. Neck turning amount is ideal when nice slip fit is obtained with bullet & fired brass. uniform neck tension, reduce cold working & extend brass life. Chamber dimensions are set by SAAMI specs. My 6.5 rounds after firing measure .297 (brass spring back) and upon bullet seating measure .290, (.003-.004 radius reduction). Neck wall thickness = .290 - .264 = .026 / 2 = .013, that neck wall thickness provides a nice slip fit, minimum work hardening, adequate neck tension & cleanup for minimal run out. Brass neck wall thickness may vary .001 or more but turning make neck walls uniform, Periodic annealing helps to reduce brass spring back. Ball micrometers are needed for measuring neck wall thicknesses, but ordinary calipers can suffice to determine diameters that provide nice slip fits of bullets into fired cases. The next problem is setting up the neck turning devices for accurate repetitive neck turning among different cartridges, bullet diameters & chambers - next to impossible or real difficult. I need to get better stuff or by separate neck turners for each chamber. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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