The "traditional" short-range target load with a 185 or 200 grain lead bullet is 3.5 grains of Bullseye, good for about 650 ft/sec out of my old National Match. Upping the charge to 4.2 grains is good for about 730 ft/sec., still very mild. My old Lyman Pistol & Revolver Handbook lists a maximum of 5.0 grains with a 200 grain cast bullet, good for 860 ft/sec at 13,400 CUP, fired out of a "Universal Receiver" with 5" barrel.
If pressures aren't high enough, powders may not burn cleanly. Try increasing your powder charge a bit.
I actually use more 700-X these days, for "hardball equivalent" loads with a cast 230 RNL. A charge of 4.8 grains burns clean and give me around 830 ft/sec or so out of a 5" 1911.
Agree with earlier posts that most of the soot and schmutz is bullet lube residue.