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Rifles, Reloading, Optics, Equipment
Reloading
neck trimming,tension,concentric,will it help?
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<blockquote data-quote="wnroscoe" data-source="post: 175818" data-attributes="member: 6698"><p><strong>All Good Points But</strong></p><p></p><p>Conceder this. With the necks turned to a uniform diameter you get uniform neck tension and with the use of a FL Bushing Die without an expander ball Case Neck Run out is greatly minimized if not completely eliminated. I tested numerous fired cases in Factory and Custom Rifles. FL Dies with bushings and standard FL Dies were used. I found that it is in the sizing portion of the process where Run out is introduced into the case and, it is when the neck is being sized that this occurs.</p><p></p><p>Two things reduced or eliminated the run out, one was not sizing the neck more than .005" at a time and the other was not using the expander ball, I know, no expander ball is a no brainier. Cases sized with the bushing die when the bushing was removed had .000" run out in the neck. When the bushing was re-introduced and sizing in the neck was more than .005", at least .002" to .003" run out was present.</p><p></p><p>I think the best way to remove as much run out as possible is to turn the necks for a 100% clean up only, use a FL Bushing Die with no expander and not size the neck more than .005" at a time, this means using two or more bushings in the sizing process.</p><p></p><p>As a result, the .308 Factory Rifles tested were shooting groups in the mid to high .2's at 100 yards and the others were shooting consistent groups under .5MOA to 330 yards. One such rifle has accounted for 1-600 yard kill, two 550 yard kills and countless 400+ yard kills. It's a Remington 700 in 7mmRM. This has been our finding and is worth the effort IMHO, as always, YMMV</p><p>.</p></blockquote><p></p>
[QUOTE="wnroscoe, post: 175818, member: 6698"] [b]All Good Points But[/b] Conceder this. With the necks turned to a uniform diameter you get uniform neck tension and with the use of a FL Bushing Die without an expander ball Case Neck Run out is greatly minimized if not completely eliminated. I tested numerous fired cases in Factory and Custom Rifles. FL Dies with bushings and standard FL Dies were used. I found that it is in the sizing portion of the process where Run out is introduced into the case and, it is when the neck is being sized that this occurs. Two things reduced or eliminated the run out, one was not sizing the neck more than .005" at a time and the other was not using the expander ball, I know, no expander ball is a no brainier. Cases sized with the bushing die when the bushing was removed had .000" run out in the neck. When the bushing was re-introduced and sizing in the neck was more than .005", at least .002" to .003" run out was present. I think the best way to remove as much run out as possible is to turn the necks for a 100% clean up only, use a FL Bushing Die with no expander and not size the neck more than .005" at a time, this means using two or more bushings in the sizing process. As a result, the .308 Factory Rifles tested were shooting groups in the mid to high .2's at 100 yards and the others were shooting consistent groups under .5MOA to 330 yards. One such rifle has accounted for 1-600 yard kill, two 550 yard kills and countless 400+ yard kills. It's a Remington 700 in 7mmRM. This has been our finding and is worth the effort IMHO, as always, YMMV . [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
neck trimming,tension,concentric,will it help?
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