Good Day,
I was shooting some 9mm surplus from my BIL's stash in my P-09, the boxes showed it was sold by InterArms, 25 to a box, and advertised non corrosive. The head stamp is VPT 44.

(Finland) It all functioned 100%. The bullets attract a magnet although not a lot.
Is it really non corrosive? Any other problems of note? I did cleaning precautions for corrosive ammo just in case, lots of rinsing with hot water followed by Hoppe's #9 and then protective lube.
Thanks,
Rob