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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Case Runout
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<blockquote data-quote="AJ300MAG" data-source="post: 24129" data-attributes="member: 444"><p>Brent, I had a problem with both my .300 & .338 Ultra's and the Rem brass. I was getting 8 out of 20 rounds with bullet runout over .005". When I checked the necks after firing, the neck runout was zero for the .338, and .0015" for the .300, which told me that my chambers were concentric to the bore. When I checked the inside of the neck, I was getting .0025" or more runout. To make the O.D & I.D. of the necks concentric I neck turned the brass only enough to get 85% clean up, took less that .001" a side off to true them up. Most pieces had 100% clean up. I set up my full length sizing die to just bump the shoulder back .001" so the bolt will close without any resistance. Another thing I did find was that the expander ball was inducing some runout in the neck also, even though the die was perfect. I tried all the usual remedies to fix but didn't find a cure. I made up a seperate expander mandrel like the one Sinclair has to expand the necks for neck turning. I set it to give me .002" neck tension. Using this method I'm getting 2-3 "rejects" per 20 rounds now. I realize you don't want to use this process when mass producing ammo on a Dillon, but its helped my load accuracy for hunting ammo.</p></blockquote><p></p>
[QUOTE="AJ300MAG, post: 24129, member: 444"] Brent, I had a problem with both my .300 & .338 Ultra's and the Rem brass. I was getting 8 out of 20 rounds with bullet runout over .005". When I checked the necks after firing, the neck runout was zero for the .338, and .0015" for the .300, which told me that my chambers were concentric to the bore. When I checked the inside of the neck, I was getting .0025" or more runout. To make the O.D & I.D. of the necks concentric I neck turned the brass only enough to get 85% clean up, took less that .001" a side off to true them up. Most pieces had 100% clean up. I set up my full length sizing die to just bump the shoulder back .001" so the bolt will close without any resistance. Another thing I did find was that the expander ball was inducing some runout in the neck also, even though the die was perfect. I tried all the usual remedies to fix but didn't find a cure. I made up a seperate expander mandrel like the one Sinclair has to expand the necks for neck turning. I set it to give me .002" neck tension. Using this method I'm getting 2-3 "rejects" per 20 rounds now. I realize you don't want to use this process when mass producing ammo on a Dillon, but its helped my load accuracy for hunting ammo. [/QUOTE]
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Case Runout
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