Not my own design, but if you do not know about it super simple tool.
I use a cracked case to determine the overall case length for a particular bullet shape and my rifle as described 100 times.
Problem was the lead tip was very often deformed coming out of its packaging box.
Commercial solution.
It allows you to change the insert depending on your caliber.
Fortunately I only have one rifle so did not need this detail.
And in use using the copper part as a reference.
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