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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity .. how important?
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<blockquote data-quote="J E Custom" data-source="post: 1440476" data-attributes="member: 2736"><p>I will take a shot at what the problem may be.</p><p></p><p>First the full length die starts to size the case body before it is all the way down on the fired case. and if the case is not of uniform thickness (And they rarely are) It will size the thin side first misaligning the case to neck OD. The chamber centers the OD of the case body and the neck. and If you turned the necks to a uniform thickness the ID of the neck will/should be centered/aligned to the bore.</p><p></p><p>I get the best results using a/the Competition bushing neck sizer because of the sleeve that holds the OD of the case body without sizing it and possibly moving the body out of alignment from the chamber.</p><p>Then the bushing can/will size the neck centered because it has a little float.</p><p></p><p>A common mistake made with the bushing dies is to leave the expander ball in the die. Proper bushing size eliminates this and only sizes once per operation. Bushings should be .001 to .002 thousandths smaller than the loaded cartridge. To much bullet grip can skue the bullet when it starts to be seated. Also be sure and de bur all case mouths to aid bullet seating.</p><p></p><p>I turn "All" necks to uniform them before the first firing, to assure the case neck is concentric after firing the first time. the case body may not be concentric on the inside, But the Outside of the case body Is and the case neck will be concentric to the bore. I check my fired brass for concentricity to verify the concentricity of the chamber, and after loading I re-check the loaded round for concentricity, this will tell you if you have a concentric chamber and a good/or bad loading Procedure.</p><p></p><p>If you don't turn the necks to a uniform thickness, at best you will be off by the difference in thickness and your chasing your tail.</p><p></p><p>Hope this helps</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1440476, member: 2736"] I will take a shot at what the problem may be. First the full length die starts to size the case body before it is all the way down on the fired case. and if the case is not of uniform thickness (And they rarely are) It will size the thin side first misaligning the case to neck OD. The chamber centers the OD of the case body and the neck. and If you turned the necks to a uniform thickness the ID of the neck will/should be centered/aligned to the bore. I get the best results using a/the Competition bushing neck sizer because of the sleeve that holds the OD of the case body without sizing it and possibly moving the body out of alignment from the chamber. Then the bushing can/will size the neck centered because it has a little float. A common mistake made with the bushing dies is to leave the expander ball in the die. Proper bushing size eliminates this and only sizes once per operation. Bushings should be .001 to .002 thousandths smaller than the loaded cartridge. To much bullet grip can skue the bullet when it starts to be seated. Also be sure and de bur all case mouths to aid bullet seating. I turn "All" necks to uniform them before the first firing, to assure the case neck is concentric after firing the first time. the case body may not be concentric on the inside, But the Outside of the case body Is and the case neck will be concentric to the bore. I check my fired brass for concentricity to verify the concentricity of the chamber, and after loading I re-check the loaded round for concentricity, this will tell you if you have a concentric chamber and a good/or bad loading Procedure. If you don't turn the necks to a uniform thickness, at best you will be off by the difference in thickness and your chasing your tail. Hope this helps J E CUSTOM [/QUOTE]
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Reloading
Concentricity .. how important?
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