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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning
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<blockquote data-quote="Hugnot" data-source="post: 2810112" data-attributes="member: 115658"><p>Yes, works just fine. After firing this "datum" point will vary in location. Don't toss good brass.</p><p></p><p>Neck turning would be required should a bullet (used as a gauge) not easily slip fit into case mouth. The general idea being avoiding pressure spikes and inconsistent neck tension by providing .002 - .003 radius for neck/chamber clearance upon firing with neck expansion.</p><p></p><p>From Redding (die manufacturer)</p><p> </p><p><strong>"Now anyone with a standard reloading press can benefit from advanced benchrest techniques.</strong></p><table style='width: 100%'><tr><td><img src="https://www.redding-reloading.com/images/stories/media/typesbushingdie.jpg" alt="typesbushingdie" class="fr-fic fr-dii fr-draggable " style="" /></td><td>The amount of resizing provided by conventional reloading dies has always been dictated by the manufacturing tolerances (SAAMI specifications) of the brass cartridge case itself. Reloading die manufacturers have been forced to design the neck diameter of their dies small enough to accommodate the thinnest possible brass.<br /> <br /> This may be as much as .008" - .010" smaller than the maximum cartridge dimensions typically shown in most reloading manuals.<br /> <br /> Since the majority of cases that the reloader is likely to encounter in the field are thicker than the minimum specifications that the dies were designed for, case necks are often resized excessively.<br /> <br /> It can be easily demonstrated that excessive resizing of the cartridge case quickly leads to stress distortion and concentricity problems. The new Type S - Bushing Style Dies offer a simple solution to this age old problem."</td></tr></table><p></p><p>This gives some idea of why bushing type dies are useful. It also provides justification for neck turning to prevent - "excessive resizing of the cartridge case" & " since the majority of the cases that the reloader is likely to encounter in the field are thicker than the minimum specifications that the dies were designed for, case necks are often resized excessively"</p><p></p><p>Turning necks a reasonable amount makes for consistent neck wall thickness, concentricity, and minimum work hardening. For 6.5 rounds, a .003 radius reduction works just fine and provides .013 neck wall thickness (no "interference" ?) and will clean up any variations of neck wall thicknesses.</p><p></p><p>Neck turning has improved 600 yard scores and brass life with .308 Win loads, like over some 1500 - 2000 round barrel life.</p><p></p><p>It should be noted that Forster provides a service to "hone" out or increase the diameter of the neck portion of their F/L dies. My 6.5 Forster F/L dies are enlarged for a die neck diameter of .288. This would provide the same amount of neck sizing as a .288 bushing die - providing adequate neck tension to hold bullets securely.</p><p></p><p>Cartridge brass is subjected to pressures often exceeding 60K psi and gradual neck thickening is expected but will vary from each piece of fired brass - like expect it to happen. Tossing good brass or "cull out" using some "mean" (average) taken at some arbitrary location to determine suitability for reload is unnecessary & wasteful. Some brass goes for over $1.50 per piece. Take control of the situation - turn necks to make neck walls uniform. F/L size turned neck brass with no expander button.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2810112, member: 115658"] Yes, works just fine. After firing this "datum" point will vary in location. Don't toss good brass. Neck turning would be required should a bullet (used as a gauge) not easily slip fit into case mouth. The general idea being avoiding pressure spikes and inconsistent neck tension by providing .002 - .003 radius for neck/chamber clearance upon firing with neck expansion. From Redding (die manufacturer) [B]"Now anyone with a standard reloading press can benefit from advanced benchrest techniques.[/B] [TABLE] [TR] [TD][IMG alt="typesbushingdie"]https://www.redding-reloading.com/images/stories/media/typesbushingdie.jpg[/IMG][/TD] [TD]The amount of resizing provided by conventional reloading dies has always been dictated by the manufacturing tolerances (SAAMI specifications) of the brass cartridge case itself. Reloading die manufacturers have been forced to design the neck diameter of their dies small enough to accommodate the thinnest possible brass. This may be as much as .008" - .010" smaller than the maximum cartridge dimensions typically shown in most reloading manuals. Since the majority of cases that the reloader is likely to encounter in the field are thicker than the minimum specifications that the dies were designed for, case necks are often resized excessively. It can be easily demonstrated that excessive resizing of the cartridge case quickly leads to stress distortion and concentricity problems. The new Type S - Bushing Style Dies offer a simple solution to this age old problem."[/TD] [/TR] [/TABLE] This gives some idea of why bushing type dies are useful. It also provides justification for neck turning to prevent - "excessive resizing of the cartridge case" & " since the majority of the cases that the reloader is likely to encounter in the field are thicker than the minimum specifications that the dies were designed for, case necks are often resized excessively" Turning necks a reasonable amount makes for consistent neck wall thickness, concentricity, and minimum work hardening. For 6.5 rounds, a .003 radius reduction works just fine and provides .013 neck wall thickness (no "interference" ?) and will clean up any variations of neck wall thicknesses. Neck turning has improved 600 yard scores and brass life with .308 Win loads, like over some 1500 - 2000 round barrel life. It should be noted that Forster provides a service to "hone" out or increase the diameter of the neck portion of their F/L dies. My 6.5 Forster F/L dies are enlarged for a die neck diameter of .288. This would provide the same amount of neck sizing as a .288 bushing die - providing adequate neck tension to hold bullets securely. Cartridge brass is subjected to pressures often exceeding 60K psi and gradual neck thickening is expected but will vary from each piece of fired brass - like expect it to happen. Tossing good brass or "cull out" using some "mean" (average) taken at some arbitrary location to determine suitability for reload is unnecessary & wasteful. Some brass goes for over $1.50 per piece. Take control of the situation - turn necks to make neck walls uniform. F/L size turned neck brass with no expander button. [/QUOTE]
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