Okay, I know the brass guage isn't reliable for exact choke measurement, but it will tell me whether the chokes are open or tight at least as well as a dime will in a 12ga bore, and the drop-in is good for all guages whereas a dime is not. That's all I really need to know at a gunshow.
Its nice too to tell when a set of barrels has been reamed way out. I once dropped my brass choke guage into an otherwise nice looking LC Smith 12ga and it fell all the way down through the chamber; the quick thinking seller piped up that he'd need to charge more for the gun since it was obviously a sought after 10ga instead of a run of the mill 12ga...Geo
