I'm interested in making the round ball "charger" shown by BerdanSS, but in the mean time I had a few old 45 Colt bullets laying around (.454" coincidentally) and made an attempt at a conical - these old bullets appear to be jacketed or plated and are likely heavier at 255 grains than the real thing, but how did I do? The discoloration is from some lube in the bottom of the chamber. It fits, but more snugly than the other. I liked the idea of using salt so that's the filler.