The jump to the rifling argument is way overblown. Some of my most accurate groups have been with .38spl ammo in .357mag chambers.
If the jump to rifling was ever an issue, then ALL revolvers would fall on their faces because of the bullet jump from the case, through the rest of the cylinder, through the forcing cone, then the freebore to the rifling. ...and yet revolvers tend to be more accurate than semi-autos who's rifling starts just past the throat.
