Lee used to sell a mould specifically for the ROA. It came in two versions, round nose and hollow point. I had one in hollow point. At one time the ROA was the only handgun I owned so I kept it loaded as my home personal defense firearm. I also did some highly 'scientific' tests with it to compare results against a round ball. The medium I shot into was a rotted stump. The bullets punched holes but did no other noticeable damage. The round balls tore large chunks out of the wood where they hit. I cannot explain why but after that I switched my defense loads back to round balls. Part of the explanation might be in velocity. The round ball allows larger charges to be put in the cylinder. And, of course, the rb is lighter in weight so will go faster. Based on that, IMHO, there is no advantage to be gained by using bullet style projectiles.