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Chambers are gang reamed in turret mills at the factory and each reamer has a plus or minus diameter tolerance at sharpening before they are replaced. This is why there are different diameters of chambers one receives in their finished guns. I always check all chambers with a plug gauge as well as the barrel bore and ream and lap to consistency in both.
I have also found chamber mouths out of round as well as over size. These irregularities show up when reamed as the bluing reveals them against the fresh reamer cuts.
Another interesting thing I have noted over the years is that a revolver can be quite a bit out of alignment and still shoot quite accurately if all chambers have the same amount of misalignment.
Still for the best accuracy of course good alignment is necessary.
I have also found chamber mouths out of round as well as over size. These irregularities show up when reamed as the bluing reveals them against the fresh reamer cuts.
Another interesting thing I have noted over the years is that a revolver can be quite a bit out of alignment and still shoot quite accurately if all chambers have the same amount of misalignment.
Still for the best accuracy of course good alignment is necessary.