Because removing metal is irreversible. Because it's unnecessary. Because there is a long history of poorly done chamber lengthening, saved from disaster only by the excessive caution exhibited by American gun makers on the dimensions of their barrels. Because shooting 2 1/2" for hunting isn't that difficult or expensive. Because I have seen too many classic vintage guns ruined by shade tree and other unqualified smiths who mess with guns without understanding what they are doing. A whole lot of "fix today's problem" without ever getting to the root of the problem. Fast forward decades and it's another gun that is beyond salvation.
