The Luger will generally like longer ammo better than shorter ammo.
If your recoil spring is a problem, it is far more likely to be because someone tinkered with it than becasue it is worn. There is a tendency for people to muck with the spring due to the urban legends surrounding the Luger when it would be far better to leave the spring alone. If you have, or suspect you have, a stock spring don't mess with it. If you are inclined to mess with a recoil spring, set the original to one side and get an after market spring to play with.
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