I've been going to the range pretty much weekly with my CZ-75B for the better part of two years. Probably a couple thousand rounds have fulfilled their purpose as a result. Being a regular, my cleaning routine is pretty standard too. I know what to expect even from firing standard white box range ammo.
A few weeks ago I was granted my CPL and I had been trying out different platforms. Finally decided on a S&W 442 .38Sp +P and took her to the range this evening. I queued up 50 rounds of Federal FMJ and a box of Speer Gold Dot 135gr +P (my intended carry ammo). The 442 is smooth as silk. Even after practicing with the CZ-75 for so long, I was getting nice tight shot groups by the end of the session.
HOWEVER, after about 10 rounds, I noticed that there seemed to be an awful lot of black "crud" everywhere. Carbon, unburned powder, whatever it was it was everywhere. There were streaks of it on my hands and little flecks of it all over the firing station. It was even falling out of the barrel/chambers as I went to reload. I didn't mind too much as it forced me to start learning a thorough cleaning routine from the start with the 442. Question though: Is all .38 ammo so dirty?