Could 20ga to 9mm chamber reducer/adapter be used as a case length gauge for plunk testing?

[arakboss]

I was thinking a shotgun chamber reducer/adapter might be able to pull double duty and be used as a case length gauge for 9mm and maybe other calibers. Does this seem like it could work?

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[orygun]

Interesting idea.
Probably not the "right" way to do it, but since the 9mm headspaces on the mouth it might be ok.

 

[red442joe]

Hmmm, I would do it. However...
I'm kinda fond of tailoring ammo to the specific gun it is used in.
My IDPA load for the Well Worn G17 allows two failures to plunk in the barrel per hundred.
Those exact same rounds fail to plunk an additional four to six in the CZ75 barrel.
2% to 8% failure.
I use Lee dies and can adjust them to "swage" any bullet to any bore/chamber.

Joe