A reamer will generally follow the hole that’s already there (i.e., path of least resistance). The key is to ensure the reamer’s inserted from the breech, and that the extension bar is supported by bushings, yet not rigid up-close to the cutting action so’s the reamer can float & follow the pre-existing hole (choke). Bear in mind however, that the geometry of the chokes lead-in taper (or ogee) will suffer material loss, unless of course, a proper reamer is ground for the task. A little careful polishing to blend the ogee/taper into the new choke would probably suffice though. Now, of course, if the chokes poi was off to begin with..the above technique is of litte use..that’s when it’s time for the lathe or the boring machine.
..an ounce of #5’s in each barrel seems to be good for pheasants in my guns.
To Dean’s comment in an earlier post - someone who’s never royally screwed something up, has never done a damn thing in any sort of shop whatsoever. Fact.
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