I'll bet you could use a 200 to 220-grain .451"-.452"semiwadcutter (Keith design) .45 ACP target bullet like the Lyman 452423,and cast from pure lead, and have excellent killing power. I have a Lee mould that casts 225-grain conical bullets designed for use in the Ruger Old Army, and I use these bullets successfully in the .45 ACP when cast from wheel weights. There's no eason why you could not "reverse" this idea, and use .45 ACP .451" diametersemiwadcutter target bullets in a cap & ballrevolver if you cast them from pure soft lead!

Note that those Power Belt bullets are NOT COPPER JACKETED bullets. They are swaged from pure soft lead and then givena very thin PLATING of copper. This allows them to be made undersize and to swage up into the rifling when fired and still prevent your bore from leading up.If they had an actual copper jacket they would not work. They'd be too tough to swage up into the rifling.