The 124-grain NATO loading moves out at just about 1250, and I think the Fiocchi pretty much emulates the NATO load. While heavy, the NATO loading should be safe in limited numbers in a Hi Power; I carry the NATO Dutch loaded with 127-grain Winchester +P+ Rangers in a Mark III that has been outfitted with a heavier (18.5 lb) recoil spring and have had no problems with the gun after quite a few rounds.
I don't shoot it often, but I know my gun will handle it. I would not shoot it in anything with collector value, like a T Series, but I have no issue with shooting it in a gun with a beefier recoil spring.
The salient issue about "safety" is about chamber pressure, no matter what the ballistics. I tend to believe the Fiocchi runs somewhat higher pressures than the NATO standard ammo, but that belief is based on nothing more than anecdotal evidence, as I've seen no verifiable figures which either confirm or contradict this claim.