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JimmyBCool,
If your smith reduced the barrel cylinder gap on an S&W he is darned good (as a practical matter, it can't be done). I suspect he may have throated the barrel, which could reduce leading and mess.
FYI, a double edge razor blade runs about .045" and makes a pretty good gage for barrel cylinder gap. Much over that is not good and two thicknesses would be a factory trip for the gun. (Don't cut fingers trying this!)
BTW, you don't want too little gap either or cylinder will hang up when hot.
Jim
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