There are only two things that can go wrong with a gun when you use it, wear/damage to the finish and failure/breakage of parts.
They don't say don't shoot a matching Luger because of risk to the finish, because a broken part is much worse for the value.
Damage to the finish will reduce the value, but its still a matching Luger, just a little more "worn". Break a part, and its never again a matching Luger.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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