Pick one for cast lead projectiles. I cast my own. Shot a few hundred Precision Delta out of my Mod. 67-1 with no problems, or lead build up. My favorite load is using about 3.3 to 3.5 grains of Trail Boss gets a guestimated 700 or so FPS out of my 4 inch barrel. Shoots nice, and pleasant. Very clean as well. Trail Boss is the cleanest pistol powder I have ever loaded with.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.