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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Tight neck chamber
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<blockquote data-quote="elkaholic" data-source="post: 1094600" data-attributes="member: 13833"><p>I admit I have not read thru this entire thread so bear with me if I repeat something. I am pretty sure that the basics have probably been well covered but I recently changed my mind on HOW tight a neck should be. I design and shoot a lot of wildcats , so I am usually working with necks more than most. Some of the parent brass MUST be neck turned, for various reasons. I use to think that the tighter, the better as long as it didn't get tighter than .001" per side in a hunting rifle, and that is too tight for most hunters! I recently did some testing with a powder that gave EXTREMELY low es, so was able to really see the affect of neck tensions, and neck clearance, on velocity (pressure). What I found was that everything I shot that only had .002"-.003" total clearance, the es went up along with the pressure, even with loads that were not high pressure loads. In the rifle that I was shooting (a 6.5 SS) things really settled down at .004"-.005" and accuracy was as good or better in every case. For long range use, es is especially important as most of you know. I know that I will likely get some flak over this statement, but that is what happened in this rifle. I think the more important issues are dealing with consistency of brass and chamber. Concentricity, uniform neck wall thickness, neck tension, trim length, etc. Of course there is such a thing as too loose, but I will be running a little more clearance than I use to run. ......Rich</p></blockquote><p></p>
[QUOTE="elkaholic, post: 1094600, member: 13833"] I admit I have not read thru this entire thread so bear with me if I repeat something. I am pretty sure that the basics have probably been well covered but I recently changed my mind on HOW tight a neck should be. I design and shoot a lot of wildcats , so I am usually working with necks more than most. Some of the parent brass MUST be neck turned, for various reasons. I use to think that the tighter, the better as long as it didn't get tighter than .001" per side in a hunting rifle, and that is too tight for most hunters! I recently did some testing with a powder that gave EXTREMELY low es, so was able to really see the affect of neck tensions, and neck clearance, on velocity (pressure). What I found was that everything I shot that only had .002"-.003" total clearance, the es went up along with the pressure, even with loads that were not high pressure loads. In the rifle that I was shooting (a 6.5 SS) things really settled down at .004"-.005" and accuracy was as good or better in every case. For long range use, es is especially important as most of you know. I know that I will likely get some flak over this statement, but that is what happened in this rifle. I think the more important issues are dealing with consistency of brass and chamber. Concentricity, uniform neck wall thickness, neck tension, trim length, etc. Of course there is such a thing as too loose, but I will be running a little more clearance than I use to run. ......Rich [/QUOTE]
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Tight neck chamber
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