Get this
And this
Measure several times writing each one down. Take average of each reading. As a tip, I find it most consistent by having the bullet extended most of the way out, have the rod set screw tightened down slightly so it keeps slight resistance and slide the gauge bullet case and all into the chamber.
When I say resistance I mean just enough so the rod doesn't move freely under its own weight.
I found while using a standard case, no matter how much I played with the neck tension, I couldn't get consistent results. Now I did find the gauge somewhere else I believe and it was cheaper when I purchased it last year but at least you know whats out there.
And as an added tidbit, consider getting a Bullet comparator tool, it will allow you to measure from the ogive to the base giving you more consistent readings, the tool above is made to work with said comparator.
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