Accuracy is not a function of caliber. It is a function of quality of barrel and rifle manufacture, bullet concentricity, and UNIFORMITY OF LOADING TECHNIQUE. For example, I have a .50 hunting rifle which has a Bill Large 1/72" twist barrel. It will shoot round balls into less than 1" @ 100 yards all day long on a calm day, (from a bench, of course!!), and also have a .45 Bill Large barrel which will do the same. I also have a slow-twist Jedediah Smith Commem. Hawken .54 cal. which is almost as good, as long as I use balls which have no casting voids in them.