Hi Erich;
Bo and I chronographed some Santa Barbara ammunition which clocked 1032 fps from the P3AT. This ammunition was imported in quantity a few years back. It gave every impression of being loaded very hot.
I bought up a bunch of it for practice use because it was cheap ($2.25 per 25 rnd. box) but didn't shoot all that much of it due to its vigorous nature.
Only my opinion but the locked breach design of the P3AT probably handles this type ammunition better than would a blow-back design.
If I tote a .380 I avoid all expanding type ammunition. The round is what it is and seems best employed to maximize penetration to the vitals.