Re: belted magnum case
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: alwayswillbe</div><div class="ubbcode-body">how far should the FL sizing die be away from the shell holder?
the length of the belt?
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By having lots of distance between the shell holder and the die, you may be able to partially neck size with the full length die and it still chambers. That is good.
But if the end of neck bumps the end of the chamber from stretch, you must trim.
But if the case shoulder touches the end of the chamber shoulder and makes it hard to re chamber the fired and partially neck sized round, you must bump the shoulder back.
If one screws the die down closer and closer to the shell holder, eventually the sizing process will push the shoulder back .002" in the die and spring back to .001" pushed back when it comes out.
The die thread is 7/8-14. That is a thread pitch of .071"
That is <span style="text-decoration: line-through">25</span> 5 degrees turn per .001" axial.
So if your first piece of brass you are trying to bump gets .003" shorter, you back off on the die adjustment .002" = 10 degrees counter clockwise.
One way to do this is to measure the distance from the shoulder of the fired brass to the case head using a Wilson case gauge and caliper or depth micrometer. Then adjust the die until it changes the measurement on the brass by .001".