Gerry,
I would use a good chamber reamer before I tried to hone out enough for proper function. The hone would be good for smoothing it up after reaming. The problem with a hone and a chamber is that you run a higher risk of messing up the chamber by flaring the end near the rim. This will cause your brass to swell and make for difficult reloading. I know this because I had a .410 that someone flared the chamber in this manner. I still haven't completed that chamber sleeving job. The chamber reamer will do the job quickly and safely. I do have some Flex-hone hones for the chamber and bore of 410 and 28g, but I wouldn't/didn't approach tight chambers with honing because of this.
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