I shoot PPU Carcano. No issues, its perfectly safe.
What people complain about is that its a undersized bullet (perfectly safe) but some Carcanos have worn bores, so the bullets tumble. (Similar to early M16 Rifles.)
People complain of accuracy issues, technically Norma is the only one making the correct sized bullet.
But for the price... PPU all the way.
Also, some carcanos have tighter bores such as mine, so they handle the PPU very well. Carcano action is quite strong, severely underrated.