Pete, what you described is correct if the choke reamer has an uniform taper of 10 thou per inch of run. A choking reamer could also be made up with several different tapers (though such a reamer would much be more difficult to grind). A choke can also be cut using multiple reamers, each with a different taper. All of these used by inserting the piloted push reamer(s) into the breech end of the barrel.
A tapered choke could be also cut from the muzzle end with one or more tapered DRAW reamers as I've seen done at a noted modern barrelsmith's shop. This setup is particularly useful for correcting an off-shooting barrel by offsetting the axis of the choke relative to the bore.
Net, full tapered shotgun chokes can have different profiles from leade-in to muzzle, and can be reamed in one or many passes and with one or more reamers.
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