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Rifles, Reloading, Optics, Equipment
Reloading
Some brass not bumping back
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<blockquote data-quote="jensenj71" data-source="post: 2871868" data-attributes="member: 96797"><p>I backed off dies to manage shoulder bump for years before I realized how much better results I could get with Redding competition shell holders with a solid cam over. If you are backing off and setting the die to get your desired bump on the first piece of brass don't measue the rest of them. I made the mistake of checking each piece and getting 0.002" plus or minus 0.001" on all pieces was pretty tough. Granted, annealing made it easier. I could usually find a spot where the shorted ones were just right and I could cycle longer ones twice to get them closer or set them aside to cycle with the die turned down slightly more. </p><p></p><p>Nothing wrong with floating the die if you have the time and patience to manage the process. </p><p></p><p>If you are only doing it to minimize the work on the brass then perhaps a larger tolerance on shoulder set back is completely reasonable. If the die would normally push back the shoulder 0.010" then backing off the die to get a 0.002" to 0.005" bump makes sense. I wanted all of the brass between 0.002 and 0.003.</p><p></p><p>In this case, the headspace of the firearm is less than the headspace of the die and shell holder assuming there is complete contact between the die and shell holder. There could be contact at the high points, but more force may drive die to full contact. A firm cam over consistently drives everything to the same dimensions independent of other variables.</p></blockquote><p></p>
[QUOTE="jensenj71, post: 2871868, member: 96797"] I backed off dies to manage shoulder bump for years before I realized how much better results I could get with Redding competition shell holders with a solid cam over. If you are backing off and setting the die to get your desired bump on the first piece of brass don't measue the rest of them. I made the mistake of checking each piece and getting 0.002" plus or minus 0.001" on all pieces was pretty tough. Granted, annealing made it easier. I could usually find a spot where the shorted ones were just right and I could cycle longer ones twice to get them closer or set them aside to cycle with the die turned down slightly more. Nothing wrong with floating the die if you have the time and patience to manage the process. If you are only doing it to minimize the work on the brass then perhaps a larger tolerance on shoulder set back is completely reasonable. If the die would normally push back the shoulder 0.010" then backing off the die to get a 0.002" to 0.005" bump makes sense. I wanted all of the brass between 0.002 and 0.003. In this case, the headspace of the firearm is less than the headspace of the die and shell holder assuming there is complete contact between the die and shell holder. There could be contact at the high points, but more force may drive die to full contact. A firm cam over consistently drives everything to the same dimensions independent of other variables. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Some brass not bumping back
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