Originally Posted By: DABHere is my two cents, it comes from measuring different shell holders for the same cartridge. and I can tell you they don't all measure the same even where it counts the most.
DAB
There are industry standards to the depth measurements of interchangeable shell holders - they cannot be less than 0.125" from the floor (the surface that the case head sits on) to the top of the shell holder.
In half a century, I have NEVER run into an interchangeable shell holder that was other than 0.125"
... There is one exception, and that is the Redding "Competition Shell Holders", which come in a set of five that are 0.002", 0.004", 0.006", 0.008", and 0.010" deeper (makes the case headspace longer). This allows the cases to be precisely fit to the chamber for a tight, or "crush" fit.
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