No +P+, Super or SMC
According to the manual as others have pointed out -they do not expressly say to NOT use +P ammo.
However in stating to NEVER use +P+ -that definitely means it is NOT rated for 45 Super or 450 SMC. Even though these cartridges say they can work in any pistol rated for +P -the Walther is not one I would say qualifies. The PPQ is not +P rated, it is just not said you cannot use it. Those are two different things. It's a borderline +P system -so I would be comfortable using ammo rated at +P for defensive carry and an occasional function check as has been pointed out above -but the pressures of 45 Super and 450 SMC are above even what +p+ would normally be at so I would say that is a definite no go. You also want what is known as a fully supported chamber for those rounds which I do not believe the Walther PPQ has.
