Not sure you can really say which is the most accurate cartridge. Jerry Michelek (sorry for the spelling) hit a plate at 1000yards with a 9mm on his second shot. All the cartridges I use are more accurate than me. Some are better at longer ranges like the 9mm (pointy nose more aerodynamic) and some are better at short to intermediate ranges 45acp. It really comes down more to the quality of the cartridge, the gun and the shooter. I am sure some are more inherantly accurate than others but for the vast majority it doesn't really matter.