If you don't know the diameter of the bore, the dime test will only tell you that the end of the barrel is too big or small to let it enter. You can infer from that it is full choked but it could also be I/C in a very tight bore or Mod in a less tight bore. The flip side goes as well. A extra large bore could swallow a dime and still be a true full choke gun. I have a Lefever with a .750 bore. Want to guess how far one of those small dimes will go? As a buyer if you are dumb enough to rely on that old dime test, when true measurements are available then so be it. Get a big dime and show him it does not go in. You can't fix stupid, even with duct tape.
