I know of no side-by-side comparisons to new vs. old ammo, and even close comparisons today may not be accurate to the pressures experienced with the same ammo. 90 years ago.
What I'd always look for is the least powerful ammo that will correctly function the pistol, and call it good.
Like you said, the +P stuff is to be avoided, as well as some military SMG ammo.
And I agree that if you have a nice Luger thats value is based on the fact that it is 100% matching numbers, it probably isn't a good decision to shoot it. Parts do break today, just like they did back then.
dju
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