As Edgar says
Choke is really the difference between the bore diameter and the constriction at the muzzle
The weakness with the tapered/wedding cake devices is that they only measure the diameter of the muzzle and that they assume a standard bore size. So older bores which may not be modern standard, or back bored barrels will be off
Bore gauges will tell you the true constriction and give you some idea if a choke has been modified
IMHO. If you are going to buy the gauge anyway. Get it 15 to 18 inches long and you can measure the bore for free
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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