Rimfire case gauge?

I have some 22 long rifle ammo that won't pass the plunk test in my High Standard barrel. I tried looking on the internet for a case gauge to perform this test, but have been unsuccessful. Anyone aware who makes one and where I may purchase it. Using the case gauge would be easier than removing the barrel.

Thank You

Greetings,

Your barrel, fully cleaned, is the best gauge.

You would have to get someone to machine a separate gauge using the same chamber reamer as your High Standard. $$$$$

Cheers,

Dave

Run a .25cal bronze brush in the chamber with some solvent.
That .22LR cartridge should plop. What manufacturer is that .22 round?