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Rifles, Reloading, Optics, Equipment
Reloading
Neck tension
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<blockquote data-quote="AZShooter" data-source="post: 2069468" data-attributes="member: 5219"><p>Watched the video and another video on the 21st Century sizer mandrels. </p><p></p><p>Pondering some of the methods employed. Author used a standard FL die to shoulder bump and size neck to a smaller dimension. Then he use the mandrel of his choice to obtain neck tension. He showed that this method yielded very low ES. </p><p></p><p>In a second related video he mentioned using a bushing die to slightly reduce neck diameter then opening it up with the mandrel. </p><p></p><p>I see these two methods as having some interesting differences. In my observations most FL dies drastically reduce the OD of the neck because there are many manufacturers making different neck wall thickness brass. The die must reduce the thinnest neck wall enough to allow the sizer ball to open the neck to a useable neck tension. It seems to me that while this would work there is some overworking of the brass. Author said he anneals after every firing so that would certainly remove the hardening aspect of the tighter standard dimension FL die.</p><p></p><p>Use of a bushing to slightly reduce the OD so a mandrel would achieve the proper neck tension will not work the brass as much. But there is the issue of some of the neck not being sized by the bushing. </p><p></p><p>Would be interesting to run a comparison of those two setups.</p><p></p><p>All interesting stuff.</p><p></p><p>I can envision a custom FL die that has a neck dimension that is not going to over reduce the neck OD but just enough for the use of a mandrel. It would size the entire neck. </p><p></p><p></p><p>Would love to see a comparison of a precision ground FL die with neck dimension made for exact neck tension vs a standard FL die and mandrel. </p><p></p><p></p><p>I have a 30 BR that uses a standard RCBS FL die with neck turned to a dimension so the die is used without a sizer ball. It makes some very straight and consistent neck tension brass.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 2069468, member: 5219"] Watched the video and another video on the 21st Century sizer mandrels. Pondering some of the methods employed. Author used a standard FL die to shoulder bump and size neck to a smaller dimension. Then he use the mandrel of his choice to obtain neck tension. He showed that this method yielded very low ES. In a second related video he mentioned using a bushing die to slightly reduce neck diameter then opening it up with the mandrel. I see these two methods as having some interesting differences. In my observations most FL dies drastically reduce the OD of the neck because there are many manufacturers making different neck wall thickness brass. The die must reduce the thinnest neck wall enough to allow the sizer ball to open the neck to a useable neck tension. It seems to me that while this would work there is some overworking of the brass. Author said he anneals after every firing so that would certainly remove the hardening aspect of the tighter standard dimension FL die. Use of a bushing to slightly reduce the OD so a mandrel would achieve the proper neck tension will not work the brass as much. But there is the issue of some of the neck not being sized by the bushing. Would be interesting to run a comparison of those two setups. All interesting stuff. I can envision a custom FL die that has a neck dimension that is not going to over reduce the neck OD but just enough for the use of a mandrel. It would size the entire neck. Would love to see a comparison of a precision ground FL die with neck dimension made for exact neck tension vs a standard FL die and mandrel. I have a 30 BR that uses a standard RCBS FL die with neck turned to a dimension so the die is used without a sizer ball. It makes some very straight and consistent neck tension brass. [/QUOTE]
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