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Rifles, Reloading, Optics, Equipment
Reloading
Interesting results from my new Sinclair concentricity gauge...
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<blockquote data-quote="barefooter56" data-source="post: 1102557" data-attributes="member: 85389"><p>engineer40,</p><p>Sounds like you hit the lottery! In regards to the use of the SINCLAIR concentricity gauge. It is best used on FIRED cartridge cases. Keep in mind that the last "forming die" that a cartridge case goes through is your chamber . So a cartridge case that is suspect before firing MAY be well within specs.</p><p>(.000-.005) indicated runout taken on a seated bullet with the probe of the indicator on the bullet as close to the bullet /casemouth junction as you can get it. Your checking of the cartridge case as you got it from the chamber and after it went though each die is also correct usage of this tool. Most concentricity issues are, especially with dies that have a locking screw that goes through the lock ring to contact the treads of the die. Are due to the die getting "cocked" in the die threads due to where the locking screw has contacted the threaded portion of the die body. A quick check is to back this screw out away from the threads of the die body so the die is now "floating " in the threads of the press. Run another checked fired case through the die in this condition and see if the runout improves to within the .000-.005 runout specs. Now to fix this issue you can get a prper diameter o-ring from the hardware store. Place it under the lock ring. Screw the die into your press until the o-ring is slightly compressed . Loosen the lock screw in the lock ring and re-adujust your die then re-tighten the lock screw in the lock ring. Or replace your lock rings with "cross-bolt style like Forster or Sinclair. Glen Ziedikers book HANDLOADING FOR COMPETITON has many hardware store fixes for concentricity problems. Making your dies so they can "float" in the press threads and self center on the round like your LEE dies seem to be doing due to the o-ring in the lock ring is a good thing. And remember "if it aint broke, dont fix it > LOL !!</p></blockquote><p></p>
[QUOTE="barefooter56, post: 1102557, member: 85389"] engineer40, Sounds like you hit the lottery! In regards to the use of the SINCLAIR concentricity gauge. It is best used on FIRED cartridge cases. Keep in mind that the last "forming die" that a cartridge case goes through is your chamber . So a cartridge case that is suspect before firing MAY be well within specs. (.000-.005) indicated runout taken on a seated bullet with the probe of the indicator on the bullet as close to the bullet /casemouth junction as you can get it. Your checking of the cartridge case as you got it from the chamber and after it went though each die is also correct usage of this tool. Most concentricity issues are, especially with dies that have a locking screw that goes through the lock ring to contact the treads of the die. Are due to the die getting "cocked" in the die threads due to where the locking screw has contacted the threaded portion of the die body. A quick check is to back this screw out away from the threads of the die body so the die is now "floating " in the threads of the press. Run another checked fired case through the die in this condition and see if the runout improves to within the .000-.005 runout specs. Now to fix this issue you can get a prper diameter o-ring from the hardware store. Place it under the lock ring. Screw the die into your press until the o-ring is slightly compressed . Loosen the lock screw in the lock ring and re-adujust your die then re-tighten the lock screw in the lock ring. Or replace your lock rings with "cross-bolt style like Forster or Sinclair. Glen Ziedikers book HANDLOADING FOR COMPETITON has many hardware store fixes for concentricity problems. Making your dies so they can "float" in the press threads and self center on the round like your LEE dies seem to be doing due to the o-ring in the lock ring is a good thing. And remember "if it aint broke, dont fix it > LOL !! [/QUOTE]
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Reloading
Interesting results from my new Sinclair concentricity gauge...
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