"Even a hard cast plain base is only good to about 1100fps"


Not hardly!

Hard cast bullets without gas checks, properly sized & lubricated, can be fired through a smooth and clean bore at velocities exceeding 1350 fps with minimal if any leading.

Almost all leading issues in handguns below the 1400 fps threshold can be traced to incorrect sizing, lubrication or cylinder throat dia. vs bore dia. relationships.

Bruce