Whilst setting a barrel back can improve the chamber and throat, it seldom does anything of consequence for an inaccurate barrel. Accuracy is far more dependent upon the condition of the muzzle end. Subject to inspection for wear or damage, removing and inch or two and re-crowning the muzzle will produce better results. Either of these jobs are only a cheap and temporary solution to any barrel problem, as opposed to a complete re-barrel. The usual reason for setting a barrel back is to correct a damaged chamber.
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