Multi-band bullets with narrow tapered bands are nothing new. During the era of the Shutzen matches, rifles for that game used such bullets. When a Pope or Schoyen rifle was purchased, it came with such a mold. Loverin took the design into the smokless powder era.
In the Schutzen matches, the bullets was seated into the breech end of the barrel with a seater and a cartridge case with powder was seated into the chamber behind the bullet. The bullet did not have a jump from the case to the barrel with the risk of striking the lands and grooves at an angle. The gases from the ignited power just pushed the bullet on through the barrel to the target. Some jaw dropping accuracy was produced by this method. The narrow tapered grooves enabled the bullet to pushing into the lands and grooves.
The Loverin design bullets gave "some" of the advantages of a breech seated bullets in a bulleted round. This only truly works well, if the top couple of bands are forced into lands and grooves. The chamber must be straight with the bore for this to work, but a cockeyed chamber is a curse on all cast bullets and most jacketed ones for that matter.