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Usually factory test firing is not enough to cause a turn line. Usually the factory fires less than 18 rounds. When I got my first Python (new) in 1979 there was no turn line. When I got to a relatives home I sent up a makeshift range for testing and fired 6 rounds through it, no turn line afterwards. The turn line is just one indicator that it has been fired. Some other indicators are lead build up in the barrel (if it hasn't been cleaned very well), flame cutting of the topstrap, carbon build up on the cylinder face. There are others but these will get you started.
