The ammo is made in Missouri although the company (Fiocchi Munizioni) is Italian. As for the power claims, it's either optimistic or an error in transferring data.
I have not used the 185 gr Extrema ammo. I have used the .45 ACP 230 gr Extrema. I have also used some of the .38 Special Fiocchi ammuntion.
I was impressed with the .38 Special stuff, especially at the price point. However, I have was not overly impressed with the .45 ACP Extrema based on initial results. That impression changed with subsequent shooting.
I bought a case of 230 gr Extrema due to price and fact that the XTP has a good reputation and the .38 Special ammo was excellent. I initially shot it in a Glock. Out of the first box, I got three failures to ignite and one defective round--the bullet was loaded off-center and split the case. Since that first box, I found no other defective rounds but I still had occasional failures to ignite the primer.
Since that initial trial, I've tried the ammo in a Colt Officer's ACP and a Ruger P345. I have had no problems with any primers failing to ignite with either of these hammer-fired guns. According to some sources I've seen, there are some primers on the hard side that striker-fired handguns have difficulty igniting. Since that problem only occurred with the striker-firing Glock, I think it is simply a case of the gun not liking the ammo.
With the Colt, I had occasional failures to fully feed. That's not unusual for this gun, however, so I don't think that was an ammo problem. With the Ruger, all rounds fed and ignited perfectly. That's pretty much business as usual for the P345--it's like a garbage disposal in its ability to handle all ammunition I've fed it. I would not hesitate to use the Extrema in the Ruger. The Glock, however, doesn't like it.
My only advise would be to try the ammo with the gun you intend to carry. If you're going to use it for defense, it is always advisable to thoroughly test your ammo for reliability.