Lee is the only maker of R.E.A.L.
aka; Rifle Engraved At Loading,,, bullet. It's made in two sizes for .45 cal, 50.cal and .54 cal. but only one size for the .58 cal.
The two sized versions per cal. have the same outside diameter yet different weights determined by length of the projectile. The REAL bullet as well as the "minne" and "maxi" style projectiles are elongated or bullet type. The only variation is that of groove depth and lubrication ring size/or shape.
Perhaps the only error made by a new shooter is to experiment with many types of projectile and lubrication searching for the best shooting group,,while at the same time forgeting that, (as same as shooting anything),true accuracy comes with consistancy of variables,practice and personal devotion to the task of accuracy