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.
George I don't think either the gauge or the dime tell you anything. With either the choke could be full or be cylinder. I have seen twelve gauge BORESs run from .707 up to .750.
I still think the remark about using the gauges for a duck decoy anchor was very accurate.
Best,
Mike
