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Rifles, Reloading, Optics, Equipment
Reloading
Determining neck bushing size for die
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<blockquote data-quote="elktaker" data-source="post: 1106826" data-attributes="member: 86786"><p>I had another thread but started this one just on how to determine neck bushing size.</p><p></p><p>My chambers neck is suppose to be:</p><p></p><p>.322" at neck </p><p></p><p>I am going to use an inside reamer:</p><p></p><p>It measures .287"</p><p></p><p>I plan to turn down my necks to .012" meaning that i would need .306 neck bushing for .002" of tension (.284 + .12(2) - .002) Correct? Hopefully, bc I order that one!</p><p></p><p>Do i need another bushing to do the inside reaming or will firing the case in my chamber and using the .287" skim the inside of the neck after its been fired?</p><p></p><p>I am not sure how the rebound of the neck will affect the inside dimension after firing.</p><p></p><p>.322"-.287" / 2 equals neck thickness of .0175" to fill chamber and have inside diameter of .287". </p><p></p><p>Do I need another bushing to bring the neck down to have an inside diameter of .287"? Math would be: </p><p></p><p>.287"(reamer)+ 2 x .012 (neck thickness) = .311" outer diameter. </p><p></p><p>I would take fired brass that has been neck turned to .012" before firing and run it through a .311 neck bushing. Then I would ream the inside with .287 reamer.</p><p></p><p></p><p>Is this correct or is there an easier way? My necks are only .0145 to .015" thick so using a neck of .0175" from the start will not work. This is from fireforming norma 300 wsm.</p></blockquote><p></p>
[QUOTE="elktaker, post: 1106826, member: 86786"] I had another thread but started this one just on how to determine neck bushing size. My chambers neck is suppose to be: .322" at neck I am going to use an inside reamer: It measures .287" I plan to turn down my necks to .012" meaning that i would need .306 neck bushing for .002" of tension (.284 + .12(2) - .002) Correct? Hopefully, bc I order that one! Do i need another bushing to do the inside reaming or will firing the case in my chamber and using the .287" skim the inside of the neck after its been fired? I am not sure how the rebound of the neck will affect the inside dimension after firing. .322"-.287" / 2 equals neck thickness of .0175" to fill chamber and have inside diameter of .287". Do I need another bushing to bring the neck down to have an inside diameter of .287"? Math would be: .287"(reamer)+ 2 x .012 (neck thickness) = .311" outer diameter. I would take fired brass that has been neck turned to .012" before firing and run it through a .311 neck bushing. Then I would ream the inside with .287 reamer. Is this correct or is there an easier way? My necks are only .0145 to .015" thick so using a neck of .0175" from the start will not work. This is from fireforming norma 300 wsm. [/QUOTE]
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Determining neck bushing size for die
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