I heard that it definitely was a problem with some types of ammo in early guns.The metal was softer in early guns and the parts more fragile.I have read many places that no +p ammo should ever be shot in older guns!!

My 40 has different(more) lugs than a 9mm(3 vs 2) and the slide and parts are more robust.In short,its a tougher gun made for a 40 cal than earlier Hi Powers set up for standard pressure 9mm rounds.

http://findarticles.com/p/articles/mi_m0BQY/is_2_50/ai_112128013/pg_1?tag=artBody;col1