pyrodex pellets in pistols
You asked about pyrodex pellets in a black powder pistol. These work wonderfully. The 44cal 30gr. pellets make loading in the field or on the range a dream. You can leave that powder flask home and no longer have to fool with a powder measure.
As for a good pistol, look into any 1858 remington repro. The 1858 is more accurate than the colts, easier to clean, and has a stronger frame. When buying opt for a steel frame, in stainless or blued. The Uberti mellenium finish is not desirable as it holds powder fouling and causes the gun to jam after a few shots.
The Italian companies make excellent guns. Uberti arms are a little fatter, so if you have big hands they make a nice choice.
As for the grease issue. I have tried all brands, but my best results is with the TC bore butter. Using this product I have managed to fire over 50 consecutive shots without powder fouling the gun, or reducing the accuracy. The bore butter is all natural, smells minty, and allows you to dissasemble and wash your gun in the sink with just soap and water. Since using the product I have found that fouling just about falls out of the gun once it hits hot water, so no bore brush is needed to clean the barrel, a simple mop will do the job. I even use it to lube the gun after cleaning instead of oil, since gun oil seems to cause fouling.
Caps for a revolver: RWS is the best thing goin, and CCI is good to. You might want to avoid remington, I've experienced failures with them.
I own five 1858 copies and love them.