I believe the CZ 75 series were originally designed for the 115gr rd. Which was still a standard Euro military rd in 1975. The CZ factory still tests their 9mm pistol line with S&B 115gr rds. The 124gr NATO was developed after the US adapted the 9mm as their standard sidearm. The Czech's were still part of the Soviet Block at this time. Undoubtedly the 124gr NATO will work fine in this CZ 75 series of pistols. The 147gr is the subsonic rd for the suppressed 9mm sidearm..
I find that the 115gr and 124gr rds works very well in my Sigs and CZs and are accurate enough for a human target at 25m. The 124gr rd will be a little more snappy than a 115gr. However, in the event that you would ever have to use it. I doubt if you would ever notice the difference. There is also a difference in the US civilian 115gr vs Euro 115gr ammo. The Euro and military will be a little hotter than 115gr US domestic ammo and be closer to the +P. The same will go for the 124gr rd.
I found that in the 60's,70's, and early 80's that certain US manufacturers of 9mm ammo were not hot enough to work the action on my German pistols 7.65mm, 9mmK, and 9mm parabelum. So I started hand loading. When I couldn't find Euro or certain US manufacturers. I fired a lot German, polish and Czech WWII surplus in the 60's. The problem they had the corrosive Berdan primers and required you to thoroughly clean your weapon after firing.
Unless you shoot competition the standard factory 115gr or 124gr rd will be fine or a 12"x18" target. 95% of the time you will only have time to just point and shoot. For competition hand loading is your best bet for real accuracy. You can find which powder, primer, and bullet that works best, at which distance, for your particular weapon. The factories do not weight and match each bullet and powder maybe a 10th of a grain or more off. They just don't have the time to do this. If they did you might then could be paying $5 a round of more.
