Combat masters is chrony'ed using a CZ, so the PF should be right on for your CZ, unless the barrel is polygonal. The PF of both 124 and 147 is lower than factory. I found the winclean left clean brass, but a layer of cement like residue through out my HK, especially on the feed ramp. Good for indoor, really clean. I have received 5000rds of 147 gr combat masters from Kurt, and although I would have preferred a pf of 131-132, (in my usp is was 137.2pf), it functioned flawlessly, and on a CED chrony the string I shot had a 4.6fps deviation.