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To answer your question - Yes. If you go to Lyman's website you will find molds for Gas Check boolits for .38 Spl/.357 MAg as well as other pistol calbers. If you do cast might I suggest a GC Keith style boolit.
Does it have to be lead. I've found that Montana Gold 115 gr fmj bullets work perfectly in all of my 9mm pistols. If you buy them in bulk ($100 for $1000 rds) they are not that much more expensive than lead. It certainly is a lot more cleaner to shoot. I really don't miss those big puffs of smoke everytime I shoot lead reloads.
I'm now using Bullet Barn for all my casts; good consistent quality, and I really like the bevel base for seating, as I can eliminate the mouth flaring step.