It looks to me, that any 124 gr. factory load UNDER 1200 ft per second, is fine.... I didn't look at the standard 115, but would think there is a bridge to cross there ae well!
Now, +P was definitely a BIG step up in velocity and I would suppose all other factors that would cause some Luger issues from too much use??
The NATO listings were, from what I could see, in a range between the two?... Soooo, as a total lack of experience guy, I would NOT shoot anything labeled NATO or/and NEVER shoot +P in my Luger! Basically, I'm just looking for stuff that works, is consistent, and reliable... best to all, til...lat'r...GT