Drop in choke gauges are useless on any shotgun unless you have some way to measure the inner bore diameter (usually at midpoint in the barrel) so you have 2 dimensions to compare (e.g., true bore diameter at midpoint = .731 with a muzzle diameter at the end of the barrel of .691 = .731 - .691 =.040 points of constriction which equates to FFFULLL choke! The old saw of using a dime to see if a trap gun has been opened up is 100% accurate in two aspects; one, you know you have a shotgun and two; you know you have a dime. Bore measuring devices such as the micrometer gauges sold by Galazan, Hosford and others are more accurate now than they have ever been. Spend the money and stop guessing!
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